How did the invention of radio contribute to a national American identity? A.
Americans began to develop a shared culture across state and regional lines.
B.
Television became the centerpiece of the average American living room.
C.
Blacks and whites saw their racial divide disappear thanks to mutual interests.
D.
National celebrities and sports figures became well-known throughout the country.

d. it adversely affected american productivity

in 1859, brown and 21 of his followers attacked and occupied the federal arsenal in harper's ferry. their goal was to capture supplies and use them to arm a slave rebellion. brown was captured during the raid and later hanged, but not before becoming an anti-slavery icon. abolitionist and insurrectionist

explanation:

the viking voyages took place during the middle ages, which was about this time. 500 to 1350. the viking voyages took place during the middle ages, which was about this time.