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States gained a large piece of western land know as the Mexican session cession.
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As it gained momentum, the abolitionist movement caused increasing friction between states in the North and the slave-owning South. Critics of abolition argued that it contradicted the U.S. Constitution, which left the option of slavery up to individual states
Muckrakers presented Americans with facts about corruption in industry and government that prompted them to demand change.
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It indicates that they wanted to keep Mecca the way that it was, and they did not want Muhammad(s.a.a.w.) to bring up a new religion that would change their way of living.
<span>This is of course somewhat of a subjective question, but in general most would agree that in general expansion was not justifiable since the Mexicans and Natives were doing nothing to provoke the US. One could argue it was justifiable since Americans needed more land. </span>
