Well, we discovered that we needed to upgrade security so that potential criminals weren't coming into our country, and so potentially harmful substances weren't being brought onto our planes. That meant literally anything that could become a bomb, start a fire, stab someone etc. As for Pearl Harbour, I think that had more of an affect on how we thought our military and defence system was working.
Trends in Latin American population growth over the past 50 years are best described as "increasing" and predominantly in the cities or places with urban reach.
The reaction can take from several hours to several days
The correct answer is C.) - the Isthmus of Panama. Isthmus is a narrow strip of land and the Isthmus of Panama was the optimal place for a channel between the two oceans.
