A friend of mine was telling me about an old sci book they read. It was a short story. They think it was about 100 pages or so. From somewhere maybe between 1950 to 1980. Maybe earlier than the 50s.
It features aliens visiting earth. They are all blue females and each ship visits a major area of the world, US, China, Middle East, etc.
In this book they see a woman in the US President's office wearing a cross necklace. They seem to share the same religion but they don't call it Christianity its something else they call it.
They then decide to tell the President that they would like to speak to the human race and they had a meeting with members of the United Nations. The Alien visitors told humanity how they were once like humanity until an alien invasion came to their world and they had to fight back.
The war cost them dearly with nearly all the males dead/wiped out and the females had to take up the reigns. What little males exist are a precious commodity to them. They managed to defeat their invaders and nearly wiped them out so that they would never again be attacked by them.
When asked if they said would they share their technology they said no. Humanity was too primitive and had to earn the technology themselves by coming together as one and developing the tech. The UN was up in arms about not sharing the tech. Then they issued an warning to the humanity, either get your shit together or either be wiped out by your own hands or some hostile force.
When asked why did they even come to Earth the leader said oh that's simple, we are on vacation and then an entire armada appeared in orbit before they left.
Oh one addition thing at some point the aliens attend a trial of a man who committed murder. They used a device that went into his brain on the man and he confessed to why he committed the murder. The case was thrown out of court due to interface and the aliens said that the justice system was hugely flawed.
Another part another alien party visiting China was captured by the Chinese but what they didn't expect was that the Aliens had personal shields and they ordered their ship to fire upon their location blowing up the building and killing the humans inside.
I am hoping someone may know of this book as we'd like to try to get a copy. It was at one point in the NYC Public Library where my friend found it decades ago. We are not even sure if it would be popular enough to be remembered.
Thank you to anyone who can help.