In a Missouri businessman, Moses Austin, had negotiated with Spain to be allowed to take three hundred settlers to Texas. This, added to the Texas annexation, the Thornton incident and the Monroe doctrine caused the outbreak of US intervention in Mexico in the Americans disembarked in Veracruz and conquered the capital, after which Mexicans were forced to sign the Treaty of Guadalupe Hidalgo, by which the United States was annexed the current states of California, New Mexico, Arizona, Nevada, Utah, Colorado and part of Wyoming.
Hispanic residents received full citizenship and Mexican Indians became American Indians. In the presidential elections, the newly created Republican Party led by Abraham Lincoln, supported the prohibition of slavery in all the territories of the United States. The southern states saw this as a violation of their constitutional rights and as the first step in a large Republican plan to finally abolish slavery.
Douglas were distributed at the national level and the votes of Constitutional Congressman John Bell focused on Tennessee, Kentucky and Virginia. Of the thirty-four states of the United States in February, seven southern slave states individually declared their secession from the United States to form the Confederate States of America, or the South.
The Confederation grew to include eleven slave states. The war broke out in April, when the forces of Confederate States, chaired by Jefferson Davis attacked Fort Sumter in South Carolina, shortly after President Abraham Lincoln assumed his position. The Nationalists of the Union proclaimed loyalty to the Constitution of the United States.
They faced secessionists from the Confederate States, who defended the rights of States to expand slavery. The South did not have boats so I could not stop the blockade. It had to be improvised an armed with articles and war boats captured to the north. On March 8, the battleship CSS Virginia attacked the blocking boats on the coast of Virginia.
Enter and the period of reconstruction takes place, which was characterized by the attempts of the Washington government to heal the wounds of war. The Constitution was modified to grant freedom and rights to blacks: Through slavery was prohibited through the thirteenth, slavery was prohibited, the Fourteenth Amendment extended federal legal protections to all citizens regardless of their race and the fifteenth Amendment abolished racial restrictions for voting .