Answer:
Explanation:
tabaquismo;
contaminación del aire en espacios cerrados;
contaminación exterior;
alérgenos;
exposición a riesgos ocupacionales como el polvo y productos químicos.
During the twentieth century, the federal government of the US country becomes stronger, more powerful, and richer in comparison to the previous years.
<h3>What is the federal government?</h3>
The government in the country of the US is called the federal government. It includes the various states and provinces of the US country which have the power to make relevant laws and take reliable decisions.
The US country became the leading country in the year 1917 in the political world. After world war II, the US country becomes more powerful in the whole world. They become a member of the trading organizations and military organizations of the world. They also had a lead role in political scenarios of the world.
Therefore, the federal government of the US country has developed a lot in the 20th Century.
Learn more about the US in the 20th Century in the given link;
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Answer:
the black codes
Explanation:
The end of the Civil War marked the end of slavery for 4 million black Southerners. the war left them landless and with little money to support themselves. White Southerners, seeking to control the freedmen (former slaves), devised special state law codes. Many Northerners saw these codes as blatant attempts to restore slavery.
<span>The U.S. wanted independence to build a canal while Panama sought to be free of Colombian rule</span>