Of course they can. There is no restriction on race or ethnicity for the use of a national symbol.
at first it was when the presidnt was there but now the flag always flys
The US Flag and POW MIA flag
Yes, it is legal in the US to fly a US, or other flag, from your car. Many people do that.
The "field." The horizontal length of the flag is called the "fly." The height of the flag is called the "hoist."
The US flag, the New York State flag (the blue flag), and the New York City flag (the blue, white, and orange flag).
The BLUE PETER. A white flag with a blue rectangle in the centre.
By international convention, Signal Flag ALFA (white hoist, blue fly, with a triangle cut out of it). In the Americas, a red flag with a white diagonal stripe is usually used instead.
A flag flown at sea is known as an ensign. They can be Red, Blue or White. Civilian and Merchant vessels fly the Red Ensign, Navy Vessels fly either the Red, Blue of White depending on the rank of the Unit. Ensigns are used in cases where it is illegal to fly the National flag, such as at sea from a British ship.
The Eureka flag is not used in any official capacity today. Occasionally, people may still fly the flag as a personal symbol of rebellion, but it has no official symbolism.
A Pow/MIA flag flies under no flag except the United States of America flag. You may fly it at any time and anywhere.
A blue triangle with a single white star at the fly and five bars alternating red and white.
It means to be patriotic (by reference to flying the flag).