Jus soli citizenship is mostly an issue because it allows people who have no ties to the country they're in to have a child who is a citizen of that country on the basis of having been born in that country. 33 countries have jus soli citizenship, and of those, 31 are located in the Americas. Much of the rest of the world employs the alternative to jus soli, jus sanguinis, or birthright by descent.
America has both, actually. If your parents are American citizens, then no matter where in the world you're born, you're an American citizen. This was the original system, with our jus soli system coming into play after our Civil War. Before, we excluded the Africans we brought over as slaves from citizenship. When the government said enough of that, the southeastern part of the current nation (and the entire southern part of the country at that time) fought a war to preserve slavery, and tore the country apart for 4 years. In the end, the Southerners were defeated on the battlefield, but it wasn't clear they would submit completely (and frankly, it is still not clear they will submit to this day!) so the northern victors amended our constitution with a new set of guidelines on what being an American meant and specific instructions on how an American is made: "All persons born or naturalized in the United States, and subject to the jurisdiction thereof, are citizens of the United States and of the State wherein they reside. No State shall make or enforce any law which shall abridge the privileges or immunities of citizens of the United States; nor shall any State deprive any person of life, liberty, or property, without due process of law; nor deny to any person within its jurisdiction the equal protection of the laws." This was designed to keep the slave states from dicking over their new free Blacks by trying to declare they weren't citizens. This amendment makes clear that not only are they citizens, everyone is entitled to the same rights. This was a major bone of contention, and Southerners have had long-standing beef with it, but weren't in a position to do anything about it considering they lost a war over it.
If you haven't noticed, America has an awful lot of very awful people, who have managed to get one of their own elected. They want to relitigate the Civil War and have been playing the long game in regards to that war and the relitigation. They want to renounce jus soli citizenship so they can 'deport' the American citizens born from non-citizen parents. While there is some justification in discussing birth tourism, the goal isn't to prevent non-Americans from having American babies. The goal is to oppress and re-enslave 'inferior' races. These are the kind of people who will gladly try to strip citizenship from Blacks, because it has been their goal since 1865, when they lost the Civil War.