Meaning of EAST in English
( n. )
Formerly, the part of the United States east of the Alleghany Mountains, esp. the Eastern, or New England, States; now, commonly, the whole region east of the Mississippi River, esp. that which is north of Maryland and the Ohio River; -- usually with the definite article; as, the commerce of the East is not independent of the agriculture of the West.
Webster's Revised Unabridged English Dictionary. Пересмотренный полный словарь английского языка Webster. 2012