1836 and 1848.
1969
The majority of the 22.67 million tourists that visit Mexico each year have American passport.
They didn't "land" in Mexico as they were one of the earliest native American civilizations to prosper in Mexico. Their civilization lasted from 1200 to 400 BC in what are known today as the states of Veracruz and Tabasco.
Hernan Cortes (1485 - 1547) qualifies as such. On February-March of 1519 he "discovered" Mexico.
The Mexican government starts to offer land to the Americans in Texas because colony. This was in the year 1820.
According to the World Tourism Organization 1,748,530 Canadian tourists visited Mexico during 2015, representing an increase of 9.3% from the previous year. Canadians are the second-largest group of international tourists reaching Mexico, after Americans.
During Spring Break, on summer vacations and winter.
1848. See related questions for further details.
It is when the US bought the land on the southern tips of New Mexico and Arizona from Mexico, right after the Mexican War in the year 1853. It was bought for railroads.
They helped them to grow food and navigate the land.
1966
The Native Americans taught the colonists a lot about the land and how to survive. Afterwards, many of the Native Americans were displaced.