ERIE CANAL:
Built 1817-1825 (think "18-25" like military time)
363 miles ("3-6-3" like a double play in baseball)
Cost $7 million (lucky number 7)
Reduced shipping costs by 95% (almost 100%)
RAILROADS:
1830: 23 miles (easy: 23 in '30)
1850: 9,021 miles (just remember "9 thousand by 1850")
LOWELL MILLS:
1836: 8,000 workers ("8 in '36")
Wages: $3-4/week (pocket change)
14-hour workdays (think "7am to 9pm")
TRANSPORTATION COSTS: Land: 30¢ per ton/mile Water: 1¢ per ton/mile (Think "30 times cheaper by water")