After Captain America retired, Falcon returned the shield to the US government or whatever. Then there was this thing about some group of orphans or whatever who were on Captain America's super steroids and mad about the UN not being able to handle the logistics of 4 billion people magically popping back into existence after being vaporized 5 years earlier.
For some reason a guy that looks like Wal Mart brand Chris Evans, but is actually Kurt Russell's son, also got hired by Elaine Benes to take some Captain America steroids so he could start killing the anarchist orphans.
Falcon teamed up with the Winter Soldier and the guy from Civil War for unknown reasons to stop them. Then he went on TV to talk to the UN lady and said "You should give these 4 billion people more food and homes and stuff". So she was all "Wait, what? I never thought of that before. That type of out of the box thinking is exactly why you should totally be new Captain America."
And with his fancy new job as an A List Avenger the formerly B-List Avenger was finally able to get a loan for his family 's Bubba Gump shrimp boat.

The film comes out 25 days after the next US inauguration and so there's a bit of wiggle room for Trump and MAGA to get an opinion on the flag colours Warren
I think the new Captain America still wears the stars and stripes, he's just a black American under them is all
As for the president in the trailer he's played by Harrison Ford and the guy that shoots him is quite an interesting character because he was one of the original super soldiers who was tested with that serum that gives them super strength but he's not as pure of heart as Steve Rogers and so a couple of inner demons might vent out of him, hence the assassination attempt because President Ross (Harrison Ford's character) is a bit of an edgy bad guy and might have done bad things to him in the past.
Just an odd synchronisation of art and life reflecting each other just now is all really
Call me ∑

Siggy, I watched it and I did not see the President in a trailer with anyone going after him.
And what kind of Capt. America is black?
Last I checked our colors are red,
white
and blue.
Not red, black and blue.
Does this mean we will have to change the colors of our flag to accommodate?
You know, to be woke?
Or will Trump and MAGA prevent that?
"Please vote to preserve the unique character of Warren…" - Robert Duvall