The Democratic candidate has won the popular vote in 6 of the last 7 elections, but of course Al Gore and Hillary Clinton didn’t become President. As national demographics change, there is a theory that an emerging Democratic majority is inevitable.
The map above shows how each county in the country voted in the Presidential election- Trump dominated in the majority of country with Clinton winning the coasts and urban areas. Additionally Republicans have dominated in state legislatures and governorships since 2008.
Shaun King has an interesting article about some of the root causes .