I would think it would be D.
A is incorrect as slavery was just made illegal.
B is incorrect as the United States could not allowed African Americans to not abide by laws.
C is incorrect as it encourage the slaves to assault the slave owners
Answer:
vaccination
Explanation:
Louis Pasteur had been working to find a vaccine that would cure cholera in chickens. His lab assistant gave an older, weaker strain of the disease to the birds. When these birds did not die Pasteur began to rethink his ideas a came up with our current method of administering vaccinations.
<span>One of the precedents that was set by the New Deal that has been put into play during periods of recession ever since is that financial aid should be supplied to the people who do not have work. This of course now exists in the form of the benefits system, in which job seekers are able to claim financial aid whilst they are still looking for work.</span>
<span> I would say True!! bc, progressives worked to improve rural health, sanitation, and to replace inefficient one-room schools with modern consolidated ones under professional control. They also extended new roads and communication services into the countryside
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