Which events initiated by President James K. Polk best helped fuff the United States's "Manifest Destiny" of expansion from the Atlantic Ocean to the Pacific Ocean?
Missouri Compromise and Compromise of 1850
Kana Nebraska Act and Fugutive Slave Act
Oregon Treaty and Treaty of Guadalupe Hidalgo
Wilmot Proviso and Texas Annexation

Correct answer is Oregon Treaty and Treaty of Guadalupe Hidalgo .

Explanation:

First option is not correct as it refers to the questions of slavery in the newly added territories.

Second option is also not correct as this acts were also covering the questions of slavery.

Also this acts mentioned above were introduced after Polk's death.

Third option is correct as it led to inclusion of new territories in the United States, and their spreading from Atlantic to Pacific Ocean. It included the territory of todays Oregon, California, Arizona, Colorado, Nevada...

Last option is also not correct and is also connected with the question of slavery.