American innovations such as the telegraph , telephone and radio had global impacts . In the USA these technologies spread information in a relatively unimpeded fashion . Communication came to maturity when technology became married to free speech , specifically during the rise of literacy and more importantly the creation of media that did not require literacy (such as radio . From an economic standpoint too , we can point to the 19th Century as an era when media consumption rose . By 1941 , according to Mike...
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