stateside (adj.)

"political organization of a country, supreme civil power, government," c. 1300, from special use of state (n.1); this sense grew out of the meaning "condition of a country" with regard to government, prosperity, etc. (late 13c.), from Latin phrases such as status rei publicæ "condition (or existence) of the republic."

The sense of "a semi-independent political entity under a federal authority, one of the bodies politic which together make up a federal republic" is from 1774. The British North American colonies occasionally were called states as far back as 1630s; the States has been short for "the United States of America" since 1777; also of the Netherlands. State rights in U.S. political sense is attested from 1798; form states rights is first recorded 1858. Church and state have been contrasted from 1580s. State-socialism attested from 1850.

Old English side "flanks of a person, the long part or aspect of anything," from Proto-Germanic *sīdō (source also of Old Saxon sida, Old Norse siða, "flank; side (of meat); coast," Danish side, Swedish sida, Middle Dutch side, Dutch zidje, Old High German sita, German Seite), from adjective *sithas "long" (source of Old English sid "long, broad, spacious," Old Norse siðr "long, hanging down"), from PIE root *se- "long; late" (see soiree).

The "long part of anything" sense is preserved hillside, it also was in 16c.-17c. side-coat "long coat." From 14c. as "lateral half of the body of a slaughtered animal." In reference to bacon, it indicates position relative to the ribs. The meaning "a region, district" is from c. 1400, as in South Side, countryside.

The figurative sense of "position or attitude of a person or set of persons in relation to another" (as in choose sides, side of the story) is recorded by mid-13c. As "an aspect" of anything immaterial (the bright side, etc.), by mid-15c.

The meaning "one of the parties in a transaction" is from late 14c.. The sense of "one of the parties in a sporting contest or game" is from 1690s. The meaning "music on one side of a phonograph record" is attested by 1936. As short for side-dish, by 1848.

The phrase side by side "close together and abreast, placed with sides near together" is recorded from c. 1200. Colloquial on the side "in addition," especially "unacknowledged," with connotations of "illicit, shady," is by 1893.