By the early 1800's, much of europe still had a less efficient transportation system than a. the roman empire. b. the safavid empire. c. the ottoman empire. d. the byzantine empire.

The early 1800s is the pre-industrial era in Europe. The answer would be A. The Roman Empire because by the 1800s, the Roman Empire had a complicated network of coastal shipping and roads with large cities by the Mediterranean and they traded with India and China for goods.

  the domino theory states that  if one country in a region came under the influence of communism, then the surrounding countries would follow in a  domino  effect.