Below is the list of "The 10 Closest States in the 2016 Election". I added a link to the 5 year chart for that states's unemployment rate and the 2020 electoral vote allocation for the state.
The 10 Closest States in the 2016 Election
1. Michigan 0.3 percent
Trump 47.6 percent, Clinton 47.3 percent
Difference: 13,080 votes
Michigan Unemployment Rate
Electoral votes allocation for 2020 - 16
2. New Hampshire 0.4 percent
Clinton 47.6 percent, Trump 47.2 percent
Difference: 2,701 votes
New Hampshire Unemployment Rate
Electoral votes allocation for 2020 - 4
3. Wisconsin 1 percent
Trump 47.9 percent, Clinton 46.9 percent
Difference: 27,257 votes
Wisconsin Unemployment Rate
Electoral votes allocation for 2020 - 10
4. Pennsylvania 1.2 percent
Trump 48.8 percent, Clinton 47.6 percent
Difference: 68,236 votes (99 percent reporting)
Pennsylvania Unemployment Rate
Electoral votes allocation for 2020 - 20
5. Florida 1.2 percent
Trump 49 percent, Clinton 47.8 percent
Difference: 114,455 votes
Florida Unemployment Rate
Electoral votes allocation for 2020 - 29
6. Minnesota 1.5 percent
Clinton 46.4 percent, Trump 44.9 percent
Difference: 44,470 votes
Minnesota Unemployment Rate
Electoral votes allocation for 2020 - 10
7. Nevada 2.4 percent
Clinton 47.9 percent, Trump 45.5 percent
Difference: 26,434 votes
Nevada Unemployment Rate
Electoral votes allocation for 2020 - 6
8. Maine 2.7 percent
Clinton 47.9 percent, Trump 45.2 percent
Difference: 19,995 votes
Maine Unemployment Rate
Electoral votes allocation for 2020 - 4
9. North Carolina 3.8 percent
Trump 49.9 percent, Clinton 46.1 percent
Difference: 177,009 votes
North Carolina Unemployment Rate
Electoral votes allocation for 2020 - 15
10. Arizona 3.9 percent
Trump 49.3 percent, Clinton 45.4 percent
Difference: 91,682 votes
Arizona Unemployment Rate
Electoral votes allocation for 2020 - 11
Something to keep a watch on in the run up to 2020.