American Centrality originated in the border region of Sector 11, inhabited mostly by various hardline political right adherents. Which included nationalism and the strong position of government even before Centrality was formed. It was seen as a sort of deviant, with most of the sector adhering to rather deregulated market economy.
After Unification Wars started, the area was repeatedly struck by various forces including Federation deserters and so on, causing increasing dissent. This was exploited by Alexander Craig, a leader of America First party, whose rhetoric of militarization to protect against threats and expand to eradicate those threats completely gave him a lot of popularity.
Already weak democratic government of the region collapsed (at least in terms of popularity) following an assault from the communist Union of American Socialist Republics in 2173. Craig use this occasion and launched a succesful military coup, soon reinforced by a popular vote (that the America First slightly 'fixed'). The now militarized country (still known as New Dallas Republic) managed to push the communists back.
Craig rewritten the constitution completely, using his surge of popularity following the victory. Reorganizing the country into American Centrality proper. Then he started the expansion, swiftly overwhelming several local planets, most of whose were already broken by the UASR invasion.
Series of victories achieved by the Centrality stopped the ongoing expansion of UASR and gave the rest of the sector time to reorganize. Soon the communists were losing on every front. But Centrality wasn't the only country to try to take advantage of it. Soon an all out war started between Centrality and American Empire
. Centrality initially was winning, but it ended with the Battle for New Denver
and the temporary alliance between Empire and USA. After the disaster that the battle turned into, the Centrality government was broken apart after Craig's assasination (the people responsible for it were never discovered, mostly due to political chaos that ensued).
Centrality space was soon mostly annexed by either Empire or USA.