Why Is It Only USA Can Interfere With Other Country's Affairs

Today's news I heard the USA accusing Iran interfering with Syria, Yemen and Hezbolla.

But according to recent article in Jerusalam Post:

The US said it would leave Syria in December 2018, reversing what had seemed like policy commitment to Syria. US President Donald Trump felt it was time to wrap things up, but he was convinced to keep a small force in Syria. Nevertheless, the major investment by the US State Department and other parts of the government was reduced. The US plans for “stabilization” seemed on hold. Now in the summer of 2019 things may be changing again.

 Please check my earlier post here

And there is a Wikipedia page here 

Some interesting comment:

......In mid-January 2018, the Trump administration indicated its intention to maintain an open-ended military presence in Syria to counter Iran's influence and oust Syrian president Bashar al-AssadIn early September 2018, the U.S. began implementing a new strategy that sought to indefinitely extend the military effort, launching a major diplomatic push to achieve American objectives in Syria. However, on 19 December, President Trump unilaterally ordered the withdrawal of the 2,000–2,500 American ground troops in Syria, which was initially set take place in a 90-day period and to be completed in 2019. The announcement shifted the scope of American interests in the conflict from what was an increasingly open-ended presence to a sudden draw-down. The fear of a power vacuum from a premature U.S. pullout from Syria drew consternation from both American officials and allies, particularly in regards to the potential of imperiling the Kurds in the face of Turkish opportunism, potentially giving Russia and Iran geopolitical wins, and the unintended consequence of allowing breathing room for extremist and terrorist groups operating in Syria to regroup and reorganize.....

I will continue later with other comments.