Why is America so guilted about its conflicts with native Americans when basically every prominent civilization has taken land from others?

Why is America so guilted about its conflicts with native Americans when basically every prominent civilization has taken land from others?
https://www.quora.com/Why-is-America-so-guilted-about-its-conflicts-with-native-Americans-when-basically-every-prominent-civilization-has-taken-land-from-others/answer/Tom-Kratman?ch=1&share=f880b7e8&srid=uUFs8&fbclid=IwAR1manEtiM9P7sYw5pFxzJLOB7EIQJ1mSKrxkEdGi0BOCOMqeAnUqxIsqPw