Health care has dominated the Democratic presidential campaign since the race began. Democratic candidates agree on the need for more government involvement in health care but disagree over how much.
More than 2,400 U.S. troops have died in Afghanistan since 2001. Democrats are divided about how and when to bring troops home.
Russia, China, North Korea and Iran are the countries cited by Democratic candidates as the top geopolitical threats.
The issue of international trade has dominated headlines in recent years, with Democrats split over the benefits of free trade agreements, such as the Trans-Pacific Partnership.
The Democratic candidates largely favor the creation of a Palestinian state as part of a final Middle East peace deal between Israel and the Palestinians.
Much of the 2020 field of Democrats would like to rejoin the Iran nuclear agreement that the United States withdrew from under President Donald Trump.
With the costs of higher education ballooning, Democratic candidates are offering an array of proposals to try to make college more affordable.
The issue of whether or not to begin impeachment proceedings against President Donald Trump has united Democrats in the wake of the Ukraine aid scandal.
Climate change, usually not at the forefront of election issues, has taken a larger footprint in the 2020 election cycle.
See where the candidates stand on two immigration issues, a topic of growing importance to voters.