structural:scholar_edition, quality:correction, stylistic:style_transfer
Transportation

New York has one of the oldest and most extensive transportation infrastructures in the country. Engineering challenges posed by the complex terrain of the state and the unique infrastructural issues of New York City brought on by urban crowding have had to be overcome perennially. Population expansion of the state has followed the path of the early waterways, first the Hudson River and Mohawk River, then the Erie Canal. In the 19th century, railroads were constructed along the river valleys, followed by the New York State Thruway in the 20th century.