There are a few things wrong with your assessments but it does show you are more than just a kid, you are watching, learning and free thinking, all of that is rare.
Democrats had control of all three houses for a while under Obama, they used it to enrich themselves more than make any real changes. That one is on them, they could have served the people that elected them and failed.
The immigration laws did not change under Trump, he just allowed them to be followed as written, the office of the President does not make the laws. I was stationed in Arizona and saw first hand why the laws were needed, had they always been enforced crime would be much lower. Just know that walking across an unsecured border leads to extreme crimes and leave it there. You really do not want to know the price young girls pay to get across the border, if they make it. Immigration is something all governments control to some degree or another, illegal immigration is something they all fight. The stealing of jobs is mostly political banter as is the more common lie of they are doing jobs Americans will not do. Put simply, controlling who gets into your house and why is necessary. The real problem amounts to this, given a chance at to enter a country that pays you to do so encourages more to come. We are a small percentage of the planet and can not afford to house the billions that would come if they could. Controls have to be set and make sense.
Bump stocks are an example of making a problem to solve one, the ability to shoot faster doesn't make a weapon more dangerous but the opposite is true, aiming is much more effective when slowed down (I am a combat vet). The faster you fire the less chance you have of hitting your target, unless you are well trained. I have never used a bump stock but they looked like toys to me and I would not want one. Generally both sides of the gun control debate have great talking points but little else in common. Criminals would still kill people even if guns magically disappeared and if they did disappear people would build more. Now that people can build all the guns they want at home, attempting to control them is a wasted effort. Addressing the reasons people seek out a life of crime is where the real effort should be spent, the hundred million armed Americans have not committed any crimes and probably never will. Legal gun owners should not be held responsible for criminals.