With 16 months until the Presidential Election of 2020, the election is settled in 35 states, and the remaining 15 states are in contention, and will decide the Electoral College and the winner of the Presidency.
8 states were Republican last time, but are, in theory, in contention:
Additionally, Nebraska is Republican, but allows split electoral votes since 1992, and in 2008, Barack Obama won the 2nd District electoral vote, so in theory, that district, including Omaha and its suburbs, is in contention.
The Democrats won 5 states that are, in theory, in contention:
Additionally, Maine is Democratic, but allows split electoral votes since 1972, and Donald Trump won the 2nd District electoral vote, so in theory, that district, including most of the state away from Portland, Augusta and nearby coastal areas, is in contention.
So both Nebraska and Maine have the potential to see one electoral vote go to the loser of the state, in the statewide race.
If the Hispanic-Latino vote can be magnified for the Democrats, it gives them the chance to win Arizona, Florida, Georgia, North Carolina, and Texas.
The close Democratic majorities in their five states in contention—Colorado, Minnesota, Nevada, New Hampshire, and Virginia—give the Republicans the opportunity to pick up electoral votes there.
It seems clear at this time that when and if the Hispanic-Latino vote increases enough for the Democrats, likely by 2024 and 2028, and with increased electoral votes in Arizona, Florida, Georgia, North Carolina and Texas assured after the 2020 Census, then the Democrats could have a lock on the Presidency for the long term, even if the Midwest states of Michigan and Wisconsin become more Republican, and even if Minnesota and Virginia were to become more competitive for the Republicans. And Colorado and Nevada, with increased Hispanic-Latino influence over the next decade, would be more assuredly Democratic as well.
Even Pennsylvania, New Hampshire, Maine, and Nebraska would matter far less, as well as Ohio, which now looks out of contention for the Democrats at present.