Progressivism refers to a political philosophy that became particularly popular during the early years of the 20th century. During these years, the middle class and the working class began demanding more rights and protection. People became concerned with the power and the success of large factories and corporations, and with the way they treated their workers.
There are a lot of vestiges left from this time period. Nowadays, we often take for granted the fact that children are protected from dangerous labor or that workers have the right to weekends and a fair wage. We also enjoy a higher participation of women outside of the workplace. Some of the institutions and laws that have roots in this era is the right to health care, minimum wage, child labor laws and public education. These institutions have had a great power because they have completely transformed the way we live and benefitted many generations of Americans.
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The Siege of Leningrad is a event which took place during WWII. This was a was a prolonged military blockade undertaken from the south by the Army Group North of Nazi Germany against the Soviet city of Leningrad on the Eastern Front in World War II.
Elasticity is a measure of variables sensitivity to a change in another variable, refers the degree to which individuals, consumers, or producers change their demand of the amount supplied in response to price or income changes.