Ummm... The Constitution and the Declaration of Independence??
The plague help lead to an economic collapse in the third century is that it contributed to a sharp decline in the supply of labor , hurting the Roman economy
The Columbian Exchange also had positive and negative effects. The positive side was the exchange of technology in agriculture, for example, which increased crop yields and food production in favor of Native Americans and in favor of Europeans. One of the negative effects was certainly the appearance of many diseases that Europeans transferred to the American continent. Native Americans first faced such illnesses, were non-resistant to them, and many of them died.
The correct answer according to the options offered is: A.
The sovereignty of all the states in the union was weakened.
Thaddeus Lowe's operations in his ground service's first months indicate considerable improvement in developing and understanding the observation balloon a significant and useful complement to the army service. He favored the captive balloons because:
- He showed that a captive balloon could be efficiently and safely propelled to and from different locations, and that the senior officers could take measurements from virtually any appropriate point chosen.
- The civil war time duration 1861 to 1863, encouraged him to experiment and make success of captive balloons, here his motivation raised as he was self made scientist and aeronaut.
- He was attempting to study medicine to satisfy the wishes of his grandmother, but the boredom diverted him to his first passion, aviation using lighter-than-air gases.
