Yeh, let's also not forget about getting that check from Mexico for the cost of the wall.
Trump got the Mexican government to cut off illegal immigration caravans to the US. Mexico's president cooperated with Trump and put thousand of their troops on the border to stop it. OK they didn't spend their money on our wall. No one expected it. That was hyperbole. But Mexico paid for their troops and Trump got the job done. That was the whole point of the wall. To stop or constrain illegal immigration.
What do you think Biden's going to do? Knock them all down? Stop the security arrangement with Mexico? Allow illegals in? I suppose he could make all illegals citizens to expand the Democratic vote, make Puerto Rico and Washington DC states for more Democratic senators and congressmen. But I don't think he'll do that too quickly. If he does, republicans will surely take Congress in 2022. Republicans did very well this election below president, better than democrats. There was no Blue Wave.
American don't want illegals or game playing which Democrats propose. If republicans hold the Senate, which is debatable, that surely will stop new states being added. Having a split government would be the best thing for America to prevent either side from doing stupid things.