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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 , .

: . - .

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. . . , , , .

7. . 1911 . " ". " ". 50 . . , , .

8. . , , , .

9. . . , , , .

10. . , .

11. . , , , , .

12. 1921 . , .

13. 1923 . . " ". 1935 ., 1936 . , .

14. . , 1922 . , , , , . ". . " . 40- .





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