It can. The mexican-american war also dealt with the future of the territories that were involved like the Texas territory. Since the United States won the territories from Mexico, the new colonies wanted to be slave colonies, and the general government disliked this. There would've been fewer slave colonies if they hadn't been conquered.
The RMS Lusitania was a ship that sailed from New York and had American civilians in - at that point the US was neutral in the WWI -, when the ship came to the sight of the Irish Coast the German U-boat attacked it.
Despite the fact that Americans were horrified at the Lusitania attack, many Americans did not like the idea to enter the war, Irish Americans did not enjoy the idea of helping Britain because the country denied Ireland its independence, German Americans were sympathetic towards their ancestral homeland and Americans saw no reason to enter into a war between European powers. The US only entered war two and a half years after it started.
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After the passage of the Homestead Act, settlers flooded to the 1. "Great Plains", where lumber was scarce. Barbed wire enabled these settlers to fence in their lands. As a result, the movements of Native Americans and 2. "cattle drivers" were severely restricted, and the era of 3. "the open range" came to an end.
What do you mean plz tell me i can help