last updated 8 May 2022

Timeline:

Apr 19, 1325. Founding of Aztec City Tenochtitlan. ...

Apr 19, 1518. Spanish Conquest of the Aztec's. ...

Apr 24, 1812. Mexican War of Independance from Spain

1836 Texas’ successful war of independence against Mexico
in 1844 President Tyler negotiated a Treaty of Annexation which caused Mexico to sever diplomatic relations with United States. However did not get enough votes in congress. In 1845 President-elect Polk, Tyler managed to get the joint resolution passed.

May 14, 1847. Mexican-American War. ...
The Mexican-American War was the first major conflict by the idea of "Manifest Destiny" (the idea that the United States is destined—by God, its advocates believed—to expand its dominion and spread democracy and capitalism across the entire North American continent.)

THe war ended in 1948 he signing and ratification of the Treaty of Guadalupe-Hidalgo . Mexico ceded to the United States approximately 525,000 square miles (55% of its prewar territory) in exchange for a $15 million lump sum payment.
THe US gained control of California, Nevada, New Mexico, Arizona, Utah, Washington, and Oregon, as well as portions of what would later become Oklahoma, Colorado, Kansas, Wyoming, and Montana. Congressman David Wilmot introduced a rider to an appropriations bill that stipulated that “neither slavery nor involuntary servitude shall ever exist” in any territory acquired by the United States in the war against Mexico.
Manifest Destiny would eventually cause a great deal of suffering for many Mexicans, Native Americans and United States citizens.

In 1861-63, French Emperor Napoleon III maneuvered to establish a French client state in Mexico, and eventually installed Maximilian of Habsburg, Archduke of Austria, as Emperor of Mexico.
In the Battle of Puebla on May 5, 1862, (Cinco de Mayo) Commanding General Zaragoza and General Porfirio Diaz pushed the french back. President Juárez declared that the anniversary of the Battle of Puebla would be a national holiday,[14][15][16][17][18] regarded as "Battle of Puebla Day" or "Battle of Cinco de Mayo"

.) May 22, 1865. Second French Intervention. ...

Aug 24, 1910. Mexican Revolution. ...
Apr 3, 1930. The Mexican Economic Miracle. ...
Jul 15, 1990. War Against Drugs

Links:
Top 10 events in Mexican History timeline | Timetoast timelines
Cinco de Mayo and the Rise of Modern Mexico | NPR