California Teacher Credentialing Examination (CSET) Practice Test 2025 - Free CSET Practice Questions and Study Guide

The concept of Manifest Destiny emerged as a prominent and influential ideology in the United States around the mid-19th century, specifically in 1845. This term was introduced because it encapsulated the belief that it was the ordained right and destiny of the United States to expand its territory across the North American continent. This notion was rooted in a sense of American exceptionalism and a desire for both land and resources, reflecting the attitudes of the time that expansion was beneficial for both the nation and its inhabitants.

The year 1845 holds significance as it coincided with major events, such as the annexation of Texas and the growing movements westward, which were endorsed by various leaders and influenced public opinion greatly. The idea of Manifest Destiny became a rallying cry for expansionists who argued that such growth was not only inevitable but also a moral duty. This helped fuel the U.S. expansion policies during that era, including the controversial Mexican-American War, which ultimately resulted in significant territorial gains for the United States.

In contrast, the earlier dates in the options do not align with the rise of this concept. For instance, 1820 is associated with the Missouri Compromise, while 1776 marks the Declaration of Independence and the formation of the nation,