Answer:
Civil War Era
Explanation:
All of these deal with the nation splitting over the expansion of slavery leading up to the Civil War.
The answer would be the Sodium potassium pump. This structure is the one that plays the main role in the controle of different types of ions under normal cellular function, as well as when cellular function is abnormal. It exchanges sodium and potassium ions from inside and outside a cell through the cellular membrane. With this, a steady amount of ions are found inside and outside.
Nativism contributed to the Act as the Chinese were considered a threat to the economic well-being of the natives. The Chinese were stereotyped as degraded, dangerous, and competitors for jobs and wages. The passage of the act characterized the outcome of years of racial hostility
i think its true as there was impact of railroads
