A democratic and republican are two political parties developed in the United States.
a) democratic and republican
Step-by-step explanation:
Since 1860s, there are two main political parties that are Republican Party and Democratic Party. Most of the seats are occupied by the Democratic Party in the House of Representatives whereas Republican Party holds the majority of senate.
These two share almost all the political powers in the country and these parties have a duopoly. The United States government is often called as two-party system.
The Democratic Party was founded in 1828 and is associated with larger government programs and higher taxes and its symbol is donkey. The Republic Party was founded in 1854 and is associated with the smaller government and lower taxes and its symbol is elephant.