The correct Answers are (B) and (C) :)
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The best theme that represents the reason of the Irish of why they came to America in the later years of the 1840s was because of their economic and survival reasons. A potato famine in Ireland was happening and there was a need for them to migrate from Ireland to avoid starving to death. Another reason was that America offered the Irish more opportunities to have jobs.
Regarding the issue of illegal immigration from Mexico to the US, the Sonora Desert could be both a hindrance and an advantage to someone who wants to cross the border into the US illegally. A hindrance due to the heat and difficulty surviving in daytime but at night time where sparsely populated it could allow people to pass unnoticed perhaps. As for rivers, it is conceivable that people could cross the border walking along the bed of a dry stream or small river in the summer when some of the waterways dry up.
Dust storms damaged farming equipment the most