How did President James Polk attempt to avoid war with Mexico? O by sending Commissioner John Slidell to sell Texas to Mexico
O by sending Commissioner John Slidell to negotiate with Mexico
O by sending Commissioner John Slidell to assassinate the Mexican president
O by sending Commissioner John Slidell on a mapping expedition to California

In spite of this, the diplomat continued to negotiate with Mexico, and on February 2, 1848, he signed the Treaty of Guadalupe Hidalgo, which authorized U.S. payment of $15 million for California and New Mexico, and named the Rio Grande as the Texas border.

Explanation:

mark me as brainlist :)

B.) By sending Commissioner John Sidell to negotiate with Mexico.

Explanation: John Sidell was sent to Mexico by President James Polk to negotiate boundary adjustments. An offer was made that if the US could acquire both upper California and New Mexico and pay up to $50 million for them, the US would pay off Mexico's debt. However, the proposal was refused due to the occupation of U.S troops in Texas.  

the monroe doctrine is the best known u.s. policy toward the western hemisphere. buried in a routine annual message delivered to congress by president james monroe in december 1823, the doctrine warns european nations that the united states would not tolerate further colonization or puppet monarchs.