XIX XX . . . , , , , . XX . , , ( ), . .
XX . . . , , . 1920 . . 1 1922 . (The Federal Communications Commission) 30 . 10-20 XX . - . . 1926 . " " (The National Broadcasting Company), "--", . . .
. 40- . XX . . 1955 . "--" "--" 15 . - . .
XX . . , , . "". , - . . XX , .
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: . - .
XIX XX . . , . , XX , " ", "", "" .
, XIX . . , 1861-1865 ., . , . (1784 .), . 1976 . 200- . " " (" ") , , . . , , "" XIX XX .
, XIX-XX . [4]
1. . 40- , - 25% . .
2. X. . , , .
3. , , , , , , 30 , , , .
4. . : " ". : " , ".
5. 1885 . , .
6. . . , , , .
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7. . 1911 . " ". " ". 50 . . , , .
8. . , , , .
9. . . , , , .
10. . , .
11. . , , , , .
12. 1921 . , .
13. 1923 . . " ". 1935 ., 1936 . , .
14. . , 1922 . , , , , . ". . " . 40- .