Why are random samples so hard to achieve in real life surveys? What kinds of biases creep into most random samples, even if pollsters are trying their best to generate a truly random sample? Are there any ways to correct them? What kinds of biases are surveyors most concerned with?

the tariff was created to protect industry in the northern part of the united states. industries in the north were being driven out of business by imported goods that were priced at a low rate. the goal was to protect these industries   by taxing the goods.

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i think iowa because you committed the crime there

nuclear weapons are hoaxes. many people believe they are real, though.