Besides the fact that Mexico and the United States border each other and are close business and trading partners, it would be an impossible feat to accomplish, due to the very nature of this relationship:
The US is already suffering the effects of an exhausting and lengthy war with two medium-sized countries with a medium-sized insurgency and population: Iraq and Afghanistan have a combined area of 1,090,407 square kilometers (421,005 square miles) and a combined population of 59.7 million people.
What would you think it would happen if the US tries to invade a country with an area of 1,972,550 square kilometers (761,606 sq mi) and a population of 112 million people, of which some 12 million of them happen to be living among Americans?
in 1916.
The Mexican American War.
it was a treaty signed between Germany and Mexico, saying that if Germany won the war they would help Mexico invade the US
He didn't. He was the president of Mexico.
1519
Mexico
They could, but the invasion would not last long, because the US military is far superior to the Mexican military. Besides, this is very unlikely, since the US and Mexico are such close allies and trading partners.
r wtsi
a chicken
Maximilian of Habsburg
16th century (1521).
1. Germans sank many of their merchant ships before the US entered the war with the their u-boats2. Germans sent a coded message to Mexico that urged Mexico to invade US that British code breakers cracked and sent to the US.