Answer:
Step-by-step explanation:
There isn't a single main difference between the two parties. They have differing views in every aspect of government. Some examples I could list out that you could potentially use are:
Economic and taxes: Democrats favor taxing the wealthy while Republicans favor flat taxes and oftentimes not raising taxes at all (which include the wealthy).
Spending on Military and Defense: Democrats want to decrease spending while Republicans want to increase.
Abortion: Democrats support Roe V. Wade while democrats oppose it.
Healthcare: Democrats support more funding towards Medicaid and Medicare as well as more affordable healthcare options. Universal healthcare. Republicans favor more private healthcare systems
Guns: Democrats want more gun restrictions while republicans strong hold to the idea that every person has a right to bear arms.
I would say the Democratic Party believes in large amounts of government involvement whereas Republicans are the opposite.