Original: Ethiopian isolationism ended following a British mission that concluded an alliance between the two nations ; however , it was not until 1855 that Ethiopia was completely united and the power in the Emperor restored , beginning with the reign of Emperor Tewodros II .
Simplified: Ethiopian isolationism ended following a British mission that made friendship between the two nations ; however , it was not until the reign of Tewodros II that Ethiopia began to take part in world matters once again .