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Expansion of the West: the Era of Colonialism (15th–20th centuries)

In the 13th and 14th centuries, a number of European travelers, many of them Christian missionaries, had sought to cultivate trading with Asia and Africa. With the Crusades came the relative contraction of the Orthodox Byzantine 's large silk industry in favor of Catholic Western Europe and the rise of Western Papacy. The most famous of these merchant travelers pursuing East–west trade was Venetian Marco Polo. But these journeys had little permanent effect on east–west trade because of a series of political developments in Asia in the last decades of the 14th century, which put an end to further European exploration of Asia: namely the new Ming rulers were found to be unreceptive of religious proselytism by European missionaries and merchants. Meanwhile, the Ottoman Turks consolidated control over the eastern Mediterranean, closing off key overland trade routes.

The Portuguese spearheaded the drive to find oceanic routes that would provide cheaper and easier access to South and East Asian goods, by advancements in maritime technology such as the caravel ship introduced in the mid-1400s. The charting of oceanic routes between East and West began with the unprecedented voyages of Portuguese and Spanish sea captains. In 1492, European colonialism expanded across the globe with the exploring voyage of merchant, navigator, and Hispano-Italian colonizer Christopher Columbus. Such voyages were influenced by medieval European adventurers after the European spice trade with Asia, who had journeyed overland to the Far East contributing to geographical knowledge of parts of the Asian continent. They are of enormous significance in Western history as they marked the beginning of the European exploration, colonization and exploitation of the American continents and their native inhabitants. The European colonization of the Americas led to the Atlantic slave trade between the 1490s and the 1800s, which also contributed to the development of African intertribal warfare and racist ideology. Before the abolition of its slave trade in 1807, the British Empire alone (which had started colonial efforts in 1578, almost a century after Portuguese and Spanish empires) was responsible for the transportation of 3.5 million African slaves to the Americas, a third of all slaves transported across the Atlantic. The Holy Roman Empire was dissolved in 1806 by the French Revolutionary Wars; abolition of the Roman Catholic Inquisition followed.

Due to the reach of these empires, Western institutions expanded throughout the world. This process of influence (and imposition) began with the voyages of discovery, colonization, conquest, and exploitation of Portugal enforced as well by papal bulls in 1450s (by the fall of the Byzantine Empire), granting Portugal navigation, war and trade monopoly for any newly discovered lands, and competing Spanish navigators. It continued with the rise of the Dutch East India Company by the destabilizing Spanish discovery of the New World, and the creation and expansion of the English and French colonial empires, and others. Even after demands for self-determination from subject peoples within Western empires were met with decolonization, these institutions persisted. One specific example was the requirement that post-colonial societies were made to form nation-states (in the Western tradition), which often created arbitrary boundaries and borders that did not necessarily represent a whole nation, people, or culture (as in much of Africa), and are often the cause of international conflicts and friction even to this day. Although not part of Western colonization process proper, following the Middle Ages Western culture in fact entered other global-spanning cultures during the colonial 15th–20th centuries. Historically colonialism had been justified with the values of individualism and enlightenment.

The concepts of a world of nation-states born by the Peace of Westphalia in 1648, coupled with the ideologies of the Enlightenment, the coming of modernity, the Scientific Revolution and the Industrial Revolution, would produce powerful social transformations, political and economic institutions that have come to influence (or been imposed upon) most nations of the world today. Historians agree that the Industrial Revolution has been one of the most important events in history.

The course of three centuries since Christopher Columbus' late 15th century's voyages, of deportation of slaves from Africa and British dominant northern- Atlantic location, later developed into modern-day United States of America, evolving from the ratification of the Constitution of the United States by thirteen States on the North American East Coast before end of the 18th century.

In the early-19th century, the systematic urbanization process (migration from villages in search of jobs in manufacturing centers) had begun, and the concentration of labor into factories led to the rise in the population of the towns. World population had been rising as well. It is estimated to have first reached one billion in 1804. Also, the new philosophical movement later known as Romanticism originated, in the wake of the previous Age of Reason of the 1600s and the Enlightenment of 1700s. These are seen as fostering the 19th century Western world' s sustained economic development. Before the urbanization and industrialization of the 1800s, demand for oriental goods such as porcelain, silk, spices and tea remained the driving force behind European imperialism in Asia, and (with the important exception of British East India Company rule in India) the European stake in Asia remained confined largely to trading stations and strategic outposts necessary to protect trade. Industrialization, however, dramatically increased European demand for Asian raw materials; and the severe Long Depression of the 1870s provoked a scramble for new markets for European industrial products and financial services in Africa, the Americas, Eastern Europe, and especially in Asia (Western powers exploited their advantages in China for example by the Opium Wars). This resulted in the " New Imperialism ", which saw a shift in focus from trade and indirect rule to formal colonial control of vast overseas territories ruled as political extensions of their mother countries. The later years of the 19th century saw the transition from "informal imperialism" (hegemony) by military influence and economic dominance, to direct rule (a revival of colonial imperialism) in the African continent and Middle East.

During the socioeconomically optimistic and innovative decades of the Second Industrial Revolution between the 1870s and 1914, also known as the " Beautiful Era ", the established colonial powers in Asia (United Kingdom, France, Netherlands) added to their empires also vast expanses of territory in the Indian Subcontinent and Southeast Asia. Japan was involved primarily during the Meiji period (1868–1912), though earlier contacts with the Portuguese, Spaniards and Dutch were also present in the Japanese Empire 's recognition of the strategic importance of European nations. Traditional Japanese society became an industrial and militarist power like the Western British Empire and the French Third Republic, and similar to the German Empire.

At the close of the Spanish–American War in 1898 the Philippines, Puerto Rico, Guam and Cuba were ceded to the United States under the terms of the Treaty of Paris. The US quickly emerged as the new imperial power in East Asia and in the Pacific Ocean area. The Philippines continued to fight against colonial rule in the Philippine–American War.

By 1913, the British Empire held sway over 412 million people, 23% of the world population at the time, and by 1920, it covered 35,500,000 km (13,700,000 sq mi), 24% of the Earth's total land area. At its apex, the phrase " the empire on which the sun never sets " described the British Empire, because its expanse around the globe meant that the sun always shone on at least one of its territories. As a result, its political, legal, linguistic and cultural legacy is widespread throughout the Western World. In the aftermath of the Second World War, decolonizing efforts were employed by all Western powers under United Nations (ex- League of Nations) international directives. Most of colonized nations received independence by 1960. Great Britain showed ongoing responsibility for the welfare of its former colonies as member states of the Commonwealth of Nations. But the end of Western colonial imperialism saw the rise of Western neocolonialism or economic imperialism. Multinational corporations came to offer "a dramatic refinement of the traditional business enterprise", through "issues as far ranging as national sovereignty, ownership of the means of production, environmental protection, consumerism, and policies toward organized labor." Though the overt colonial era had passed, Western nations, as comparatively rich, well-armed, and culturally powerful states, wielded a large degree of influence throughout the world, and with little or no sense of responsibility toward the peoples impacted by its multinational corporations in their exploitation of minerals and markets. The dictum of Alfred Thayer Mahan is shown to have lasting relevance, that whoever controls the seas controls the world.