After the Civil War, Kansas was advertised as a good place for African Americans to settle. The 1859 Kansas Constitution opened the state to all settlers regardless of their ethnic or racial background. In the 1870 census blacks made up 4.6 percent of the state's population.
D is the correct answer
He increased the labor force
Some of the instruments used by meteorologists to study weather are:
1. Thermometer - this instrument measures the temperature of the air
2. Barometer - measures atmospheric pressure
3. Anemometer - measures the speed of the wind. Some anemometers also measure the direction of the wind.
4. Hygrometer - measures relative humidity (the amount of moisture in the air).
I think your answer would be C