JNA was yugoslav army and Croatia was part of Yugoslavia, so they had army bases in Croatia. So it was not an invasion but a civil war and Croat propaganda always mentions they were invaded.
So JNA forces didn't enter Vukovar from Serbia and even if they did, it was justified because it was a civil war. This is a semantic argument at best. The fact is that the JNA at the time acted as de facto Serbian military. Why was Dubrovnik bombed by the Montenegrin branch of the JNA? Was Mladić, who led the war effort in Dalmatia not a JNA officer? I really don't understand where you're getting these facts from.
And that myth that serbs were in all high positions in army does not hold water, there were many Croats and last president of presidency was Croat
Here are some facts instead of cherry picking and vague assertions:
Percentages of Croats in state bodies
In 1971, Yugoslavia had a little over 20 million inhabitants, of which the share of Croats was 21.6 percent (4,426,221 inhabitants), and Serbia, which included Vojvodina and Kosovo, had 8,446,591 inhabitants (41.2 how much).
According to some authors, there were only 20 percent Croats in the Croatian UDB, and about 30 percent in the police. According to estimates, the number of Serbs in these bodies was from 76 to almost 80 percent. For example, in Vinkovci, out of 46 employees of the Secretariat of Internal Affairs (SUP), only one was Croat, and that was in an administrative job, and in Zagreb, out of 13 chiefs of police stations, only three were Croats.
The JNA is a mirror of national inequality
One of the most sensitive federal institutions in terms of its role, but also the importance of the national composition, was the Yugoslav People's Army (JNA). However, any public expression of opinion about problems in the army could provoke a reaction and accusation of hostile intentions. Certainly the most sensitive issue related to the JNA was the national composition within the army.
Available data on the structure of officers confirm the most unfavorable structure for Croats. According to some historians, in the late 1960s and early 1970s, Serbs and Montenegrins, who had a share of 43.8 percent of the total population, had more than 67 percent of generals and officers. The national composition of active officers shows a decrease in the percentage of Croats and Slovenes, and a large increase in the percentage of Serbs and Montenegrins since 1945.
Nevertheless, numerous data support earlier conclusions about the unbalanced national structure of officers at lower levels. Even where it would have been expected that there would be a larger proportion of Croats and Slovenes, especially in the Fifth Military District based in Zagreb, the situation was not like that.
Thus, in the Fifth Military District, there were 12 Serb chiefs of staff of regiments and brigades, and only five Croats. Also, there were 34 Serbs among battalion and division commanders, compared to nine Croats. The biggest difference was among company commanders, where there were as many as 228 Serbs and only 43 Croats.
Resurgence of Serb supremacy in Bosnia and Herzegovina
Considering the significant presence of Croats in Bosnia and Herzegovina, it is important to analyze data about that republic. In the Socialist Republic of Bosnia and Herzegovina, it also happened that the share of Serbs was much higher than would correspond to their share in the total population.
According to the population census, 39.57 percent of Muslims, 37.19 percent of Serbs, and 20.62 percent of Croats lived in BiH in 1971. However, according to data from the same year, in the Union of Communists of Bosnia and Herzegovina, the share of Croats was only 11.1 percent, while the share of Muslims was 28.3 percent, and Serbs 53.5 percent.
From 1945 to 1966, only 2.75 percent of the officers of the BiH Ministry of Internal Affairs were Croats, almost 10 percent were Muslims, and as many as 87.13 percent were Serbs. Likewise, according to data for the period from 1945 to 1991, 9.30 percent of Croats, 23.60 percent of Muslims and 66.60 percent of Serbs were in the State Security Service (SDS).
It is interesting that there were most Croats in the structures of suspicious persons and those who were considered enemies of the state. Thus, at the end of the 80s, Croats led the way with 73.19 percent, followed by Muslims with 16.83 percent, while Serbs were the least with 15.62 percent.
It has to do that most of history is scam, globally and nationally. I did not live then so can not know, just know Croatia had under offical history small period of independance and then came under Hungarians and after under Austrians.
It's accepted in historical circles in Croatia that Tomislav may not have been crowned king, but it's also accepted that Croatia was a kingdom from the first half of the 10th century. At the beginning of the 12th century it became part of a personal union with the Hungarian kingdom and existed officially all the way up to 1918. Before the kingdom, Croatia was divided between competing duchies for an additional couple of centuries, which was pretty normal at the time in Europe.