It is "the opportunity to expand their knowledge and learn skills."
Como consecuencia de aquellas tensiones y del sentimiento anti-chino, el gobierno de los Estados Unidos proclamó el Acta de Exclusión China (1882), la primera ley de este país en prohibir la inmigración de un grupo étnico o nacional específico, con el agravante de que sus medidas se mantuvieron en vigor hasta nada menos que el año 1943
The correct answer is:
A. Machines rapidly produced large amounts of products.
The development of a system of mass production in manufacturing meant that machines rapidly produced large amounts of products.

<span>The increase in the number and population of Africans in the southern colonies can be described as the onset and ramping up of the slave trade. As owning slaves started to provide economic benefits to plantation owners, it became an in-demand business for those who were bringing slaves from Africa.</span>
i would say b because it make the most sence to me but dont quote me on that