No, it would absolutely not stimulate the economy. You're sort of just blasting a random talking point without much thought to it.
The US also has no obligation to the present generation just because of the abuse of their black ancestors - such an assertion is just ridiculous.
If you think handing out free-money like that "stimulates the economy" then you are totally wrong. In fact, you are hurting the economy and society by making light of racial issues where they already have no place.