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Answer: Slavery was a point of contention in the United States since the country's founding. The disagreement intensified as the 1800s began. In 1820, the Missouri Compromise established a boundary that wouldn't allow new slave states above this line. Dred Scott had been taken by his owner to an area in which slavery had been made illegal because of the Missouri Compromise.
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There has been a debate about border control. Donald Trump wants to take action through buidling a wall along the border but the democrats do not want this. This creates a policy gridlock, where no policy is passed due to each party not wanting the other party to get its way.