In some rural areas of asia, women can have several husbands at one time. this practice is known as:

Hello there,
The answer to your question is polyandry
Polyandry(polygamy) in which a woman has more than one husband.

Hope this helps :))

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The changes to agriculture in the united states since 1900 is that increased mechanization has increased food production, thereby increasing the need for labor. there has been an increased need for higher speeds of food production due the fact that the population in the united states continues to rise.