An unexpected Alliance indeed!
Even the upper echelons of the new humans took quite a long time to gradually confirm that this fact was beneficial to the future of humanity before they resolutely made up their minds.
If this matter were suddenly made known to the general public, there was a certain probability that it would generate strong xenophobic sentiments. Such xenophobic sentiments were likely to be irrational. The masses would also worry that this inexplicable Half-sphere Civilization might pose a latent danger or deceive humanity...
Therefore, the measures that government officials could think of for the time being were to slowly guide public sentiment over time. With longer coexistence, more contact, and deeper understanding, announcing the news might be slightly better received.
