Monday is both Inauguration Day and Martin Luther King Jr. Day. Why it matters: The U.S. Postal Service, stock markets, banks and many schools are closed for the federal holiday, but not because it's the day President-elect Trump is sworn in as the 47th president.

In 1983, about 20 years after King's "I Have a Dream" speech, legislation for a Martin Luther King Jr. Day on the third Monday of January cleared Congress and President Ronald Reagan signed it

With President-elect Donald Trump's inauguration falling on Martin Luther King, Jr. Day, members of the Black community in Boston said the coincidence generates some complicated feelings for them.