The correct answer is (B.
By 1838, all of the following Central American countries became sovereign republics except El Salvador. The correct option among all the options that are given in the question is option "b". The country of El Salvador got its independence in the year 1841. The other countries in the question had already got their independence by 1838.
The answer for this is the telegraph because it is way older then the second industrial revolution because the telegraph was created in 1843 and the second industrial revolution started in the 1870 all the way to 1914.
Answer:
Chinese Civil War, (1945–49), military struggle for control of China waged between the Nationalists (Kuomintang) under Chiang Kai-shek and the Communists under Mao Zedong. The end of World War II and the collapse of the United Front
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