Verb conjugation of "taxieren" in German

I will send you a summary of the activities from our last vacation last year, but I will be brief, so I will send only the highlights. It is best if we discuss everything, in the beginning of August.
I grew up in Angola, but now I'm in Hanover, not far from your border town. I used to study at the university in Boston, Massachusetts. I have graduated from MIT, which is the technology institute.
Have you ever visited the U.S. before and if so, where have you been in the U.S.? I've been travelling in California, it was very amazing. We have traveled by car. Here are my corrections.