the area of unstable plate tectonics that causes earthquakes and volcanic activity along the Pacific Ocean is known as the ring of fire. The ring of fire is also known as circum-pacific belt. It is a 40,000 kilometer horseshoe shaped area that includes 452 volcanoes and accounts for approximately 90 per cent of the worlds earthquakes.
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Erie Canal impacted westward expansion because it connected the Hudson River to the Great Lakes. This allowed American settlers to have access to the rich land and resources.
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Answer:
finding treasure, mostly in the form of gold
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The Spanish exploited both the resentment of the Aztec subject peoples and the chaotic royal succession of the Inca. European horses and guns scared the Amerindians.
Trade union or strike both fit.
Trade union however makes more sense
A trade union is made up of skilled workers