The New republic Era

After the fall of Palpatine’s Empire, a new age of prosperity briefly came about where the core of the Rebellion re-formed the Galactic Republic. Things were not as stable as the propaganda might have suggested, however. The Imperial Remnant was still extremely strong and fought hard to re-establish the Empire.
In 20ABY a brilliant Chiss, Admiral Thrawn, led a renewed assault on the Republic and took half the Galaxy by storm. Although heavily out-numbered and out-gunned, Thrawn was unquestionably a military genius and the Republic was outwitted at every turn. Thrawn used the Imperial navy almost exclusively to achieve victory. By the use of blockades and terrorising hyperspace trading lanes, he forced many worlds to cede to the Empire simply to maintain the imports and exports. Not needing to defend worlds, he was able to strike were he pleased and with force. In turn the Republic was ironically forced to put down rebellions and fight itself in order to retain territory.
In the end, the galaxy was divided, and when Thrawn died in 42ABY, The Empire controlled nearly half of the Galaxy.

Thrawn

The New republic Era

Star Wars: Raiders of the Lost Empires JohanChill