The United States government can’t even produce a budget anymore. How is it going to manage a wealth fund when the two sides are pulling in nearly opposite directions?

I fear we’ll have the same situation monetarily as our budget:

1) Democrats invest in green energy and infrastructure.
2) After four (or at most 12) years the Republicans come into power and emphasize drilling and border wall building.
3) The money dwindles away as the Republicans purposefully waste it. When the Democrats get back in charge, the account is empty. The Republicans grin and say,”Awww shucks… I guess you can’t do anything now.”

...then leave Dems to take the blame and fix.

and if you can find one of those that's acceptable, it then has to be preferable to reversing one of the others.

Given the apparent impossibility of doing any of the latter, it seems unlikely this could go anywhere.

I heard Trump say this just the other day. Although in his hands, this could easily become a slush fund to line his pockets.

annual budget decisions.

but americans are too corrupt to have something like this

They can pass infrastructure spending bills which help the economy both in providing jobs and in assisting with the transportation of goods from one area of the country to another.
They can also pass education spending bills to assist people with gaining a higher education which also then lifts them up and provides more money into the economy because they earn more money thus spend more money.
So really Congress can already invest in the country if they choose to or they can choose to loot the country like the Republicans have been doing for the last 40 plus years

Other countries such as Norway keep some of the profits from natural resources/oil to invest for the public good. I have always wondered why the US allowed big oil to get all the benefits from a resource that they didn't create.

They should specify that the funds would be for education, raising retirement benefits, giving each newborn a savings account, public housing and poverty reduction.

It would help rebalance the inequities of extreme wealth accumulation.

Yep, done!

Australia has 2 of them:

Super funds - working people have compulsory employer contributions paid into a Super fund (think compulsory 401K) with people being able to contribute themselves as well.
Currently holding A$3.5 trillion in retirement savings.
Those dollars are invested in the stock market and infrastructure projects eg toll roads.

Future fund - A$290 billion in the bank.
Earmarked for future spending as needed.

Medical Research Future Fund: $23.1 billion
Disability Care Australia Fund: $19.1 billion
Aboriginal and Torres Strait Islander Land and Sea Future Fund: $2.3 billion
Future Drought Fund: $4.9 billion
Disaster Ready Fund: $4.7 billion
Housing Australia Future Fund: $10.4 billion


EDIT:
Notice the focus is on benefitting people?
I'm currently retired and benefitting from my Super fund as a regular tax free income.
Returns have averaged 7% over the last 20 years, no bank account can equal that.