Final answer:
The concept of America's God-given right to expand to the Pacific is known as Manifest Destiny, which included ideas of inevitable expansion, Americanization, and spreading freedom.
Step-by-step explanation:
The concept you're referring to is Manifest Destiny. This concept was coined in the 1840s and it supported the expansion of the United States from the Atlantic to the Pacific Ocean. It included several key ideas: inevitability of U.S. expansion, the Americanization of new territories, and the notion that spreading the U.S. territory was spreading freedom. Manifest Destiny was also a justification used for the displacement of Native Americans and the incorporation of new lands into the Union. It was rooted in the belief that God had chosen Americans to control the Western Hemisphere. Thus, the correct answer to your question is a) Manifest Destiny.