Answer:
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Answer:
The germ theory of disease.
Explanation:
Ignaz Philipp Semmelweis is widely credited with the invention of the use of antiseptics in the reduction of puerperal fever in clinics.
However, the piece of scientific knowledge that he was missing to explain his discovery was the germ theory of disease.
<span>A large number of immigrants arrived, and they sought acculturation programs at settlement houses. Their total population was almost 8 million in numbers.
</span>They lived in urban areas and most of them worked for the low paying jobs. The immigrants <span>came from </span>northern<span> and western </span>Europe <span>including Great Britain, </span>Ireland<span>, and Scandinavia. But also a huge number of immigrants were from southern and </span><span>eastern Europe.</span>
Among the other achievements of Reconstruction were the South's first state-funded public school systems, more equitable taxation legislation, laws against racial discrimination in public transport and accommodations and ambitious economic development programs (including aid to railroads and other enterprises).
