Answer:
Over the last two centuries the dipole strength has been decreasing at a rate of about 6.3% per century. At this rate of decrease, the field would be negligible in about 1600 years. However, this strength is about average for the last 7 thousand years, and the current rate of change is not unusual.
They were opposed because of the terrible living conditions but once times got rough in the 30s and the US was desperate , they began to become lenient because they needed the labor .
Natural increase is the difference between the number of births and number of deaths during a year. As it is a natural increase it means there are more births then deaths in a year increasing the population.
Read it carefully and slowly
