What action of the Mexican government caused Congress to declare war? 100 points Mexico accused the United States of trying to take California away from them.

The U. S. was insulted by the Mexican government's treatment of Slidell's mission and refusal to accept his offer.

Mexico accused the United States of attempting to take New Mexico by settlement and even armed occupation.

Mexico demanded the U. S. leave Texas and give all that land back to them.

Mexican troops crossed the Rio Grande and attacked U. S. forces.

Explanation:

The Mexican–American War,[a] also known in the United States as the Mexican War and in Mexico as the Intervención Estadounidense en México (U.S. intervention in Mexico),[b] was an armed conflict between the United States and Mexico from 1846 to 1848. It followed the 1845 U.S. annexation of Texas, which Mexico considered Mexican territory since the Mexican government did not recognize the Velasco treaty signed by Mexican General Antonio López de Santa Anna when he was a prisoner of the Texian Army during the 1836 Texas Revolution. The Republic of Texas was de facto an independent country, but most of its citizens wished to be annexed by the United States.[4] Domestic sectional politics in the U.S. were preventing annexation since Texas would have been a slave state, upsetting the balance of power between Northern free states and Southern slave states.[5] In the 1844 United States presidential election, Democrat James K. Polk was elected on a platform of expanding U.S. territory in Oregon and Texas. Polk advocated expansion by either peaceful means or by armed force, with the 1845 annexation of Texas furthering that goal by peaceful means.[6] However, the boundary between Texas and Mexico was disputed, with the Republic of Texas and the USA asserting it to be the Rio Grande River and Mexico claiming it to be the more-northern Nueces River. Both Mexico and the USA claimed the disputed area and sent troops. Polk sent U.S. Army troops to the area; he also sent a diplomatic mission to Mexico to try to negotiate the sale of territory. U.S. troops' presence was designed to lure Mexico into starting the conflict, putting the onus on Mexico and allowing Polk to argue to Congress that a declaration of war should be issued.[7] Mexican forces attacked U.S. forces, and the United States Congress declared war

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