Only if you think that inter-war Yugoslavia really was a new state, rather than an expanded Kingdom of Serbia.
With the demise of Austria-Hungary, it was probably inevitable that Central Europe would switch completely to driving on the right eventually, but some of the changeovers are baffling. Why, for example did Brazil change? All the countries with which it had all year round road links drove on the left at the time, which meant that most of the area & population of South America drove on the left.
And China - why? It was (& is) big enough not to care which side neighbours drove on, & had just gained a road connection to India (the second largest, in population, country driving on the same side) via Burma. It had no road connection to most of the USSR, & I doubt that travel across the French Indo-China border mattered. Strange that it changed.
The former British colonies in West Africa make sense, for the most part, having land borders only with countries driving on the right - except that Nigeria had more people & money than all its neighbours put together, & not much trade with them. It was arguable that it would have made more sense for the former French West Africa to change the other way,
Sudan & Ethiopia - well, once one changed, one can see some logic for the other. But neither had cross-border road connections worth worrying about, so why bother? Still pretty much the case.
And Myanmar was just weird.
Outside mainland Europe, & outliers such as Panama, the one-way traffic from left to right was rather odd.
