Answer:
Using a mixture that included lime and volcanic sand, the Romans created a very strong and durable type of concrete. Arches made of this substance could support a lot of weight. As a result, Romans were able to build massive structures, such as aqueducts, which provided water to cities.
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why do you ask that if you already know the answer
One effect of Reconstruction after the Civil War was the improvement of opportunities and rights for the African American population in the U.S. Albeit a slow process, at least there was a beginning to enable the population as a whole to really address some of the horrible effects of slavery. The South rejoined the Union and slowly made progress back to normalcy. Many consider Reconstruction a failure because the changes desired were not as quick to come about.
Answer:
its a or d but im pretty sure its a no what yea its a
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