Social Darwinism helped to justify imperialism
by suggesting that it is natural and acceptable for powerful and wealthy nations to colonize regions that are less powerful.
nations used this theory to justify the practice of political, economic, and cultural colonialism.

answer is 1935

because gandhi led a march the sea in 1930 and 5 years later he did it again

can we see the cartoon?

incident infrared radiation is blocked. visible and ultraviolet radiation heat   earth.

earth radiates infrared radiation. infrared radiation is blocked and heats earth. visible and shortwave radiation heat earth.

earth radiates longwave radiation

longwave radiation is reflected downward longwave radiation heats earth