What was the effect of the economic crash of 1929? options:

Immigration numbers fell in response to the declining economic opportunity.

Tax policies were amended to increase revenue and pay for public services.

Many banks failed as numerous depositors attempted to withdraw their savings.

Factories were retooled and refurbished to meet changing economic conditions.

I'm pretty sure it's C

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the monroe doctrine is the best known u.s. policy toward the western hemisphere. buried in a routine annual message delivered to congress by president james monroe in december 1823, the doctrine warns european nations that the united states would not tolerate further colonization or puppet monarchs.