President Donald Trump signed a deal with Denmark and Greenland on Tuesday.

The deal wants to make the Arctic and North Atlantic safer.

It also calms things down.

Trump had often said Greenland should become part of the United States.

The signing happened during the U.N. General Assembly in New York.

Trump said the deal was very good for Europe, the United States and everyone.

He said it was amazing for Greenland.

For months, Trump said he wanted Greenland to join the U.S.

He also said he might take the land from Denmark by force.

Denmark is a NATO ally.

Greenland rules itself, but Denmark controls it.

On Tuesday, Trump did not answer questions about this.

He did not say if the U.S. plan to buy Greenland was over.

Officials from the three sides talked for months in secret.

Danish Prime Minister Mette Frederiksen had warned that a U.S. takeover would end the Atlantic alliance.

The deal lets Washington update and grow its work at the Pituffik Space Base.

The base is in northwest Greenland.

The U.S. can also make defense areas at Narsarsuaq in the south and Mestersvig in the east.

It may make more defense areas.

It may also make its military work or buildings stronger.

Trump told the U.N. General Assembly that the U.S. would build two very big military bases.

No non-NATO country may build military bases in Greenland.

No non-NATO country may keep soldiers there for a long time.

This is true unless the signers agree.

The deal has no end date.

If Greenland becomes independent, it will agree to stay in NATO.

It will also take Denmark's rights and duties under the deal.

Researcher Mikkel Runge Olesen said Greenland and Denmark can end the crisis.

They do not have to give up control of their land.

He said the U.S. gets a somewhat better deal than the old defense treaty.

But he warned that lost trust will take many years to rebuild.

Frederiksen called it a deal that can last forever.

Greenland's prime minister, Jens-Frederik Nielsen, called it a win-win-win agreement.