The United States is the Superpower Nation in the world.

Is it possible because they put on their Money “In God We Trust” that G-d has rewarded them?

Possible.

G-d rewards those that believe in Him and do His will.

I heard a story of a Japanese Ambassador to Lithuania that helped to save thousands of Jews during the Holocaust, by issuing them visas to Japan.

Is it because of this that Japan is now one of the richest nations of the world?

Possible.

But look at the end of the story:

Prior to his leaving a mission of Jews from the Vilna Synagogue came to thank him.
“What you have done for the Jewish People will never be forgotten, and we will pray to God to bless you and your descendants.”

He lost his job and lost his pension due to pressure from Germany. To help his family he started a small workshop. The name of the workshop was Mitsubishi.

In Torah there are two parts of Trust

Emunah / Belief in G-d – is belief in G-d that He Exists and Does only Good

Bitachon / Faith in G-d – is surety that He will do what you hope is Good for you.

They Go hand in hand. One must work on both.

My Rebbi told me a story about two rabbis that were discussing whether G-d will provide something for a person unconditionally if he believes that G-d will give it to him or that G-d will only provide that that a person needs if he believes He will.

One rabbi said to the other “I will prove to you my point. I don’t need a gold watch. I believe that Hash-m will provide me with a Gold Watch.”

A short time later, there was a knock on the door. A man asked to speak with the Rabbi of the community. He explained they were deciding on dividing and inheritance. “We couldn’t agree on what to do with one item so we decided to give it to the Rabbi. So here – we would like you to have this gold watch.”