The Netherlands proclaimed it's neutrality during World War I, and their neutrality was respected. It also proclaimed itself neutral during World War II, but a little detail like that didn't bother Hitler. He invaded The Netherlands anyway.
The United States proclaimed its neutrality and isolationist policies while Europe was being split up and fighting.
well many countries declared neutrality but i believe your thinking of Switzerland
Turkey
Turkey
Switzerland has a long history of neutrality.
becouse it is why.
Serbia
It is not true. Neutrality, as pertains to war, means that a country is choosing not to participate in the war. They are choosing not to join any side and want to be left alone. Sometimes a neutral country does choose a side- like Italy during World War I (they had chosen not to join the Central Powers, and then were basically bribed by the Allies to join their side), or Belgium during both World Wars (both times they were invaded by Germany, despite being neutral). But when this happens, the country ceases to be neutral.
That is called "neutrality". Sometimes the neutrality is respected by the warring countries (Switzerland in World War II) and sometimes it is not (The Netherlands in World War II).
Only a few, but most notably, Sweden. Sweden practiced neutrality at war, so Hitler went around them.
Turkey and Egypt