A is correct.
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It made transportation and trade easier.
Chinese cultural revolution leader Mao Zedong used "group communication" to talk to the masses, since he wanted to emphasize the group nature of his reforms that had to do mostly with eliminating any non-communist elements of society.
Investigating the reasons Slavery was canceled. In 1807, British Parliament abrogated the purchasing and offering of slaves. Shockingly, until 1833-when all parts of subjugation were abrogated you were still permitted to claim a slave. This sickened people in general thus they made a stop to bondage.
Because they had a insane army