Gold quickly became an economic boom in the west and led to an increase in
immigration from?

It cemented the idea of the United States as an expansionist, transcontinental empire. It fulfilled the nation's vision of Manifest Destiny – creating one nation from Atlantic to Pacific. It shaped the land on which many Americans live today. And it led directly to the California Gold Rush.

Explanation:

although world war i began in 1914, the united states did not join the war until 1917. the additional firepower, resources, and soldiers of the u.s. to tip the balance of the war in favor of the allies. remaining neutral. when war broke out in 1914, the united states had a policy of neutrality.

a phrase from a poem by ralph waldo emerson about the battle of lexington and concord. emerson's words read, “here once the embattled farmers stood / and fired the shot heard round the world.”