I think it's because slavery costs less...just a guess.
A single party system is where a single party has all the power and no opposition or any other party exists. ... In a multiparty system, the number of parties is unlimited. Anyone can establish a party if he meets necessary conditions. This is a true of democracy. And a monarchy is a form of government in which a group, generally a family representing a dynasty, embodies the country's national identity and its head, the monarch, exercises the role of sovereignty.
The key foreign policy issues that America had to face during the 1800´s were: to protect United States ships; and to deal with pirates.
