What events slowed the growth in population from 1930 to 1940

The stock market crash of 1929 was the catalyst that brought about the Great Depression that lasted until around 1939.

Explanation:

As a result of the fall of the stock market, consumer spending decreased, industries slowed production, and unemployment rates steadily increased. Instead of people migrating to the area, people were leaving in search of work, etc. More women joined the workforce (which would’ve also had an effect due to lower marriage and birth rates).

the correct answer is

d) rocket launcher

since most of current immigration into the u.s., both legal and illegal, is coming from latin america. it would be very difficult to imagine or rationalize a country my fellow citizens are trying desperately to flee into, would pose a threat to my prosperity or freedom. since the u.s. has a long history of intervention, but no record of permanent occupation, i would not feel oppression is the main objective.  

the largest free trade nation, along with the largest gdp in the world wanting to expand it's economic policy on us, and including us, could only be positive. the u.s. government has no interest in, or way of simply forcing american culture on us. and has no track record of it. other nations that adopted american social culture, or "americanization" did so voluntarily, mainly through the choice of allowing american businesses and u.s. citizens to come into their nations, as free operatives.