Mexican Revolution
Interim presidency: May–November 1911

With the Federal Army defeated in a string of battles with irregular, voluntary forces, Díaz's government began negotiations with the revolutionaries in the north. In historian Edwin Lieuwen's assessment, "Victors always attribute their success to their own heroic deeds and superior fighting abilities... What happened in the spring of 1911 was that armed bands under self-appointed chiefs arose all over the republic, drove Díaz officials from the vicinity, seized money and stamps, and staked out spheres of local authority. Towns and cities as well as the countryside, passed into the hands of the Maderistas."

Díaz sued for peace with Madero, who himself did not want a prolonged and bloody conflict. The result was the Treaty of Ciudad Juárez, signed on 21 May 1911. The signed treaty stated that Díaz would abdicate the presidency along with his vice president, Ramón Corral, by the end of May 1911, to be replaced by an interim president, Francisco León de la Barra, until elections were held. Díaz and his family and a number of top supporters were allowed to go into exile. When Díaz left for exile in Paris, he was reported as saying, "Madero has unleashed a tiger; let us see if he can control it."

With Díaz in exile and new elections to be called in October, the power structure of the old regime remained firmly in place. Francisco León de la Barra became interim president, pending an election to be held in October 1911. Madero considered De la Barra an acceptable figure for the interim presidency since he was not a Científico or politician, but rather a Catholic lawyer and diplomat. He appeared to be a moderate, but the German ambassador to Mexico, Paul von Hintze, who associated with the Interim President, said of him that "De la Barra wants to accommodate himself with dignity to the inevitable advance of the ex-revolutionary influence, while accelerating the widespread collapse of the Madero party." The Federal Army, despite its numerous defeats by the revolutionaries, remained intact as the government's force. Madero called on revolutionary fighters to lay down their arms and demobilize, which Emiliano Zapata and the revolutionaries in Morelos refused to do.

The cabinet of De la Barra and the Mexican congress was filled with supporters of the Díaz regime. Madero campaigned vigorously for the presidency during this interim period, but revolutionaries who had supported him and brought about Díaz's resignation were dismayed that the sweeping reforms they sought were not immediately instituted. He did introduce some progressive reforms, including improved funding for rural schools; promoting some aspects of agrarian reform to increase the amount of productive land; labor reforms including workman's compensation and the eight-hour day; but also defended the right of the government to intervene in strikes. According to historian Peter V. N. Henderson, De la Barra's and congress's actions "suggests that few Porfirians wished to return to the status quo of the dictatorship. Rather, the thoughtful, progressive members of the Porfirian meritocracy recognized the need for change." De la Barra's government sent General Victoriano Huerta to fight in Morelos against the Zapatistas, burning villages and wreaking havoc. His actions drove a wedge between Zapata and Madero, which widened when Madero was inaugurated as president. Zapata remained in arms continuously until his assassination in 1919.

Madero won the 1911 election decisively and was inaugurated as president in November 1911, but his movement had lost crucial momentum and revolutionary supporters in the months of the Interim Presidency and left in place the Federal Army.
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