One of the most significant challenges is building an airplane had to do with "propulsion", since the technology that allowed motors to have enough energy to lift an airplane into the sky with a passenger wasn't available for most of history.
Answer:
yes
Explanation:
he was in fact the second president to be impeached the first being Andrew Johnson, who was impeached in 1868. The approved articles of impeachment would be submitted to the United States Senate on January 7, 1999. A trial in the Senate then began, with Chief Justice William Rehnquist presiding.
Many historians agree that westward expansion was indeed the primary source of contention between the North and South in the sense that it made the question os slavery unavoidable. Each new state had to be determined slave or free--leading to disagreements that led to the Civil War.
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