Answer:
1. Disagreements over proposed Constitution.
2. Controversial presidency of John Adams during 1790s.
Explanation:
In "Historical Perspectives: What Caused Political Parties?”, the two prevailing views on why parties formed in the early republic are as follows:
1. The rise of debates and disagreements over the newly proposed Constitution in the 1780's between the Federalist and Anti-Federalist supporters.
2. The formation of Thomas Jefferson's Democratic-Republican party during the controversial presidency of John Adams during 1790s.
