The US declared war on Germany on Dec 11th 1941, (two days after Germany declared war on the US).
Everything since that date to the present is after.
No Germany declares war on US
The invasion of Poland at 4.4oam caused ww2 when Germany invaded Poland and targeted several parts of Poland Krakow,Lodz and Warsaw. The British GOVERMENT declared war. Hilter came along and said "World War 2 begins" WWII: Nazi Germany invades Poland, beginning the Second World War in Europe.' * September 3 - WWII: United Kingdom, France, New Zealand and Australia declare war on Germany. Nepal declares war on Germany. United States declares its neutrality in the war. South Africa declares war on Germany. Canada declares war on Germany.
In World War 2?
STEPS TO WORLD WAR ONE 1. Franz Ferdinand was assisinated, July 28 2. Austria-Hungary declares war on Serbia, July 28 3. Russia mobilizes armed forces 4. Germany declares war on Russia, August 1 5. Germany declares war on France, August 3 6. Germany invades Belgium, August 4 7. Britian declares war on Germany, August 4 8. Austria-Hungary declare war on Russia, August 6 9. France and Britian declare war on Austria-Hungary. Sorry i dont have the dates for all of them,='(
september 1939
it became global
They declared war on Germany because of the alli system. Germany invaded Polland (who Britain were allies with) and so Britain declared war on Germany and so did France and so on until like the whole world was involved. (Btw you need 2 be more specific in your question lol)
Austria-Hungary declared war on Serbia, then Germany offers to support A-H. Russia then offers to help out Serbia. Germany then declares war on Russia, and France sees this as an opportunity to get fight Germany, so they join Russia's team. Germany then invades Belgium (neutral territory), and Britain then declares war on Germany because Britain and Belgium had an agreement of protection. The war began officially on 28th July, 1914.
Battle of tannenberg
Which war? For the USA WWI was declared in 1917 as allies and WWII declaration was made 12-8-1941 the day after Pearl Harbor was bombed. In England they declared war on Germany in 1917 for WWI and in 1939 for WWII.
Britain and France declared war on Germany. Canada, Australia, New Zealand and South Africa declared war on Germany. Italy declares war on the Allies Germany, Finland, Hungary and Romania declared war on Soviet Union. Britain declared war on Finland, Hungary and Romania United States declares war on Japan Germany and Italy declares war on United States Italy declares war on Germany (changed sides) Romania declares war on Germany (changed sides) Soviet Union declares war on Japan I think you missed out Britain, Australia and New Zealand declaring war on Japan. Oh, and don't forget that Costa Rica declared war on Germany ... It provided the government of Costa Rica with an opportunity to seize German property.
China, USA and USSR