The definition of preemptive is  something done in anticipation of another action or done to prevent something from happening. When the military takes action against forces they believe intend to do harm to them, this is an example of a preemptive strike.
Newsfront. Just 1 percent of illegal immigrants living in the United States last year were deported-a dramatic 25 percent drop from the previous year-a change the Obama Administration says is on purpose due to a shift in focus. illegal,immigrants,deported,drop. 400.
The United States admitted more legal immigrants from 1991 to 2000, between ten to eleven million, than in any previous decade. In the most recent decade, the ten million legal immigrants that settled in the U.S. represent an annual growth of only about 0.3% as the U.S. population grew from 249 million to 281 million.