I think it is (C) Most Mexicans remained poor while Americans invested in Mexico's unfair economy
Thomas Edison invented the most widely available version of the light bulb. With the advent of AC/DC electricity cities soon began to have streetlights. This would make for a good crime deterrent.
Actually, the categories what are included as the exclusive powers of the Federal Government include those that are expressed or enumerated, implied power, and inherent power, except for RESERVED POWER. This is the kind of power which is the opposite of expressed power. Hope this answer helps.
A.THEY REFUSED TO STAY AS A RUNAWAY SLAVES Because THERE WERE NO TRAIL TO PROVE SLAVE STATUS