You forget that Japanese PM resigns very often ... so only picture modifications tell nothing.
At least, Japanese people could vote to another party with different opinion ...
China and Vietnam still have to give all the trust to the Communism Party ...
I thought you being Vietnamese would give you some insight into one party system, are you really Vietnamese?
American democracy doesn't mean 2 different systems, if Romney was elected instead, the direction America will go will not differ very much, there will be some but not too much.
One party system can have way larger changes look at China, great leap forward, to cultural revolution, opening up China to today another leap towards free market with a trial at Shanghai.
Communist party is open to ALL VIETNAMESE AND CHINESE, Communist party has no permanent leaders, communist party has internal blocs.
For example, Li keqiang has been dubbed the farmer bloc with emphasis on the rural community while Xi is of the business bloc that focuses on business development that drives Chinese growth.
How is this not different party, elections happen same as America, the two blocs fight it out for control of party, in US it's republicans and democrats, in China it is these two and possibly more.
True American public get the final say, but believe me, that choice is not as important as you might think, it basically leaves somethings in the air, if a weak but popular president get elected, like Obama, he will be limited at every turn because he is democratic president, all the major organs of the country don't have to listen to him, he is the mouth, the face, not the brain or the heart.
I won't get anymore detailed due to the size of this topic, but please think with your own head, bring your own life experience into it, think what single party means, think what democracy means. Don't take my word or anyone's word, think for yourself.
I like to use a Japanese general's words, he is the father of modern Japanese cavalry that defeated the Russian elites in Russo Japanese war.
He said to his brother, don't read a newspaper, until you formed your own opinion.