How was the issue of slavery decided in the territory ceded by mexico?
congress declared the territory free.
residents exercised popular sovereignty.
the new states’ constitutions permitted slavery.
mexico required that the territory remain free.

The correct option is "The new states’ constitutions permitted slavery."

A Mexican cession or territories lost by Mexico are the territories that Mexico was forced to cede to the United States to end the military occupation of the country between 1846 and 1848, as a result of the Mexican-American war. This cession was formalized through the Treaty of Guadalupe Hidalgo, signed in the town of the same name on February 2, 1848.

The relations between Mexico and the United States during this period are marked by American territorial expansionism. Since the first US diplomatic mission in Mexico, Minister Joel R. Poinsett left no doubt about the expansionist appetites, which were intended to annex the province of Texas, citing as proof the Louisiana Purchase Treaty, including all that Mexican territory. The position of Mexico is strong: only the limits of the Treaty of Adams-Onís of 1819, which marked the territorial limits between the territory of New Spain and the United States, will be accepted. After many negotiations, that treaty was ratified on January 12, 1828. In response, the US government collaborates with the Texan majority that wants to become independent from Mexico and become a new state of the United States, although they do not accept their incorporation initially. According to reports of General Mier y Terán, in 1829 the English speakers surpassed 8: 1 to each Mexican. Mier y Teran proposed the establishment of presidios, the colonization of the territory by Mexicans and Europeans, as well as the establishment of customs. Texans, on the other hand, were concerned about the restrictions on slavery imposed by the Mexican authorities, which had abolished that institution in the rest of the territory and marginally tolerated their presence in Texas. The following year, Lucas Alamán promulgates a Law of Colonization, by which it tried to block the massive arrival of American citizens to Texas. The law regulated colonization, which would be directly controlled by the Government, regardless of the employers; 3000 men from the military garrisons of the nearby States and Territories (who refused to cooperate) would be sent and "poor and honest families" would be sent as settlers to Texas. But in those circumstances, taking into account the data of Mier and Terán, it was already impossible to control the province.

In 1836 a multitude of Texan independentistas, commanded by William Barret Travis and Davy Crockett, became strong in the old mission of El Álamo, in San Antonio de Béjar, and declared themselves against the dictatorship of Antonio López de Santa Anna, declaring also the independence of Texas.

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