then how can US declare they have won the vietnam war ?

over 50k dead soldier n fight more than 10 years in vietnam, fighting with those orang kampung that use knife, spear n booby trap for animal ? 

Because Saigon fell to the Viet Cong?

Basically, they withdraw because of political pressure at Nam or failed at nation building in Afghanistan.

If they have political support like when they did in WW2 they’ll win, especially if they have the support to drop a few nukes.

china rumored air projects:
H-20 - 5
PLANMC VTOL fighter - 3
Navalized 6th-gen manned fighter (J-XD(S)T) - 4
Navalized UADF (not GJ-21) - 4
C-5/An-124-class transport - 3
Stealth helicopter - 2
An-225-class transport - 1
AVIC AHL - 4
Y-30 - 4 Y-30 or Y-15 Confirmed! recent flight shown prototype exists
JH-XX - 1
Hypersonic air breathing recon drone - 2
PL-17B/Next gen ULRAAM - 3
PL-21 - 2
Exclusive to stealth aircraft long range AAM - 3
Non-civilian common aircraft platform for next-gen special mission aircrafts - 3
C919-based special mission aircraft - 2
Ultra heavy AEW&C - 1
Carrier-based transport aircraft - 4

this year Christmas present what will China army deliver

They never declared they won. They went to Vietnam to stop the Commie North Viets from attacking the South Viet. But you cannot win unless you nuke the whole North Vietnam and occupy their land. Which is not their intention. They absolutely massacred all the Vietcongs who attacked them like ants.

USA did massacred but Vietnam civilian through orange agent
That increase resistance which drived USA withdrawal follow by collapse of south vietnam government

So now Trump want to focus only on America sphere. Let you all rest of the world embrace all the totalitarian rule that yall crave for.

Govern me harder daddy.

You know the non-secret. But you don't know the top secret. Should the arm forces tell you all their secret? Hell no... Russia the superpower until now cannot defeat Ukraine that they thought weak.

It is just America First policy
Nothing righteousness and purely self centered mindset
But yes, it saved millions of life from USA driven war

So what is China waiting for? Invade Taiwan lah. Just do it.

You don't invade your own country

You just need to take back what's belong to you

Yet whole world wants to go to America....

Really? Why r u still here?
In fact, have u ever go US before? Plenty homeless