He provoked Mexico into war by allowing incursions of American militia into ill-defined, disputed land between the recently-acquired Texas and Mexico. When skirmishes between the milita and Mexican troops resulted in American casualties, he used this as casus belli to start the Mexican-American War (1846-1848). You should note however, that his real objective was expansion into the west, being California the crown jewel.
The Mexican War was fought from 1846 to 1848 during Polk's presidency.
He had provoked Mexico into war.
He organized a rebellion in Mexican California
Polk had provoked the Mexicans into a war, then claimed that they had started it.
It was the Mexican-American war in 1846-1848. It was called "mr. Polk's war" by those who believed that president James K. Polk's aggression was an attempt to extend slavery. They called it this to take away national support of the war.
President Polk was responsible for the Mexican American War.
The Mexican War was fought from 1846 to 1848 during Polk's presidency.
Polk
The Mexican War was fought from 1846 to 1848 during Polk's presidency.
He had provoked Mexico into war.
That he had provoked the War.
President Polk
President James K. Polk
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James Knox Polk was the US president during the Mexican War.
James Knox Polk was the US president during the Mexican War.
He created the conditions that caused the war.