The Expansionist Era included a time frame identified as 23,643 years prior to the Battle of Yavin. This same period is also known as 12,810 years following the Tho Yor Arrival, 19,990 years before the Treaty of Coruscant, 22,643 years antecedent to the Ruusan Reformation, and 23,608 years prior to the Great ReSynchronizaton. During that year, the planet Uphrades underwent intense volcanic events, which ultimately led to exceptionally rich soil quality many millennia into the future.