Answer:
The Founding Fathers disliked political parties, which at the time were called Factions. Members of factions were considered to be motivated by ambition and self interest, not the interest of the nation. The arguments between Jefferson and Hamilton so upset George Washington, that he devoted a lot of his Farewell Address to the evils of political factions, warning the nation to avoid forming political parties.
Because there were arguments and disagreements over how the new nation should be governed under the Constitution, including economic and political issues, groups developed and those with similar opinions joined together to form the early political parties as views changed about the value of ambition and the motivation of factions.
The first organized political party in the United States was made up of the followers of Thomas Jefferson, calling themselves Democratic-Republicans. Those who followed the ideas of Alexander Hamilton organized and called their party, Federalists. The Jeffersonian Democratic-Republicans were so successful, that the Federalist party virtually disappeared after the Election of 1800.
When Andrew Jackson decided to run for the office of President, the Jeffersonians had dropped the Republican part of the party name, and Jackson is considered by some to be the founder of the present day Democratic Party. Actually, the Democratic Party traces its roots back to Jefferson.