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.