The German military
The Treaty of Versailles had been very punitive toward Germany, limiting it to an army of no more than 100,000 men, a navy of only a few dozen ships (and no submarines), and an air force of no more than 100 unarmed search and rescue aircraft. Hitler's rebuilding of the German military, in violation of the Versailles terms, actually began in secret in 1933 but went public in 1935. By then Germany already had a 300,000 man army and over 2,000 war planes, with plans for additional buildup.
After generations of being under the authority of a strong king, the authors feared a strong central government. Instead they wanted the states to have more power, so it, the power, was distributed into the hands of multiple people, not one (like a king). In fact, they didn't even have a chief executive (president). Hope that helps.
Even though against President Andrew Jackson's veto, the Congress passed the Civil Rights Act of 1866 and resulted to the impeachment of President Andrew Jackson. The conflict between the Congress and President Jackson involved the South and the Confederates.
