1793. 1851. Number of States 15 31 Representatives and Senators in Congress 135 295 Population of the U. States, 1850 3,929,328 23,267,498 Do. Boston, do. 18,038 136,871 Do. Baltimore, do. 13,503 169,054 Do. Philadelphia, do. 42,520 409,045 Do. New-York (city), do. 33,121 515,507 Do. Washington, do. ---- 40,075 Amount of receipts into Treasury, do. $5,720,624 $43,774,848 Am't of expenditures of U.S., do. 7,529,575 39,355,268 Amount of imports, do. 31,000,000 178,138,318 Do. Exports, do. 26,109,000 151,898,720 Do. Tonnage, do. 525,764 3,535,454 Area of the United States, do. 805,461 3,314,365 Rank and file of the army 5,110 10,000 Militia (enrolled), ---- 2,006,456 Navy of the United States (vessels), None 76 Do. Armament (ordinance), -- 2,012 Number of treaties and conventions with foreign powers 9 90 Number of lighthouses and light-boats 7 372 Expenditures for do. $12,061 529,265 Area of the first capitol building in square feet ---- 14,641 Do. present capitol (including extension) ---- 4-1/3 acres Lines of railroads in miles ---- 8,500 Do. Telegraphs ---- 15,000 Number of post-offices 209 21,551 Number of miles of post route 5,642 178,671 Amount of revenue from post-offices $104,747 $5,552,971 Amount of expenditures in the Post-Office Department 72,040 5,212,953 Number of miles of mail transportation ---- 46,541,423 Miles of railroad ---- 8,500 Public libraries 35 694 Number of volumes in do. 75,000 2,201,632 School libraries ---- 10,000 Number of volumes in do. ---- $2,000,000