Three specific events or beliefs that led to the development of the two-party system

1.  Supporters of Hamiltons vs. Supporters of Jeffersons.

2.  Federalists and Democratic-Republicans

3.  The Farewell address by George Washington

Explanation:

1. Supporters of Hamiltons vs. Supporters of Jeffersons: following the independence of the United States. The financial and economic policy to follow, a case that was argued openly by Hamilton vs Jefferson, caused division among the citizens and eventually led to the idea of a two-party system.

2. Federalists and Democratic-Republicans: during the war between France and Great Britain, the Federalists in their attempt to avoid war, prefer not to support France, while the Democratic-Republicans preferred to support France as a return favor to the French's help in American Revolution. The subsequent actions and actions caused further division in the country and led to a two party system.

3. The Farewell address by George Washington: following George Washington's two-term stint as United States President, he left a farewell message address which the citizens at the time were divided on his opinion. According to Washington, an alliance with any nation outside the USA should be temporary and circumstantial. This led to the emergence of a two party system in the US.