Human traffickers or desperate citizens.
The names of the first illegal aliens in the United States are not known. There are millions of illegal immigrants that are in the US, as of 2014.
About 900 thousand illegal imiigrants smuggle drugs ointo the u.s.Since absolutely no one knows how many illegal immigrants actually enter, and then stay, in the U.S. no one can ever know.
Please don't equate "illegal aliens = criminals". Anybody can, and sometimes does, commit crimes, not just illegal aliens.
Yes, if they aren't illegal aliens.
aliens. People living in the US who are not US citizens are generally called either "resident aliens" or "illegal aliens." There are other classifications for non-citizens, such as foreign exchange students and diplomatic employees of other nations, such as ambassadors to the US and their staff.
23 (America)
12 million
In general terms, no. The people who usually do murder Americans and Mexicans alike are those who smuggle them into US territory, known as coyotes or polleros. These people by the way, are Mexican-Americans.
Tens of thousands
Depends on how many illegal aliens... One truck per every illegal alien.
They can, as long as they don't get caught.
Legal aliens came to the US with the proper paperwork. Illegal aliens came to the US without that paperwork. Some of them came to evade dangers in their own countries or because they had family here. Some came for economic opportunity. Some came to participate in criminal activity.