Hitler emphasized on taking land fast, so he created the Blitzkrieg, or lighting war. It relied on mobile units, or a mobilization army and limited artillery to create confusion and disrupt enemy front lights. This war strategy saved a lot of lives and was considered genius. The tactic worked extremely well on Poland, and eventually broke into France.
Assuming that this is referring to the same list of options that was posted before with this question, the proper answer would be "(2) The United States is ignoring the threat <span>caused by foreign aggression."</span>
The Indian Removal Act took place in the first half of the 1800s under the presidencies of Andrew Jackson and Martin van Buren and directly led to the Trail of Tears, which resulted in the death of many members of tribes in the American South. It was considered controversial because the Supreme Court ruled in favor of the tribes' cause wherein the state of Georgia (which was actively seeking to evict the Indian inhabitants) was told it had no right to force their removal. Nevertheless, the president ordered their removal.
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Protective tariffs supported domestic industry by making American goods more affordable than foreign goods.