There was no "Germany" as a single political entity in 1719. There was the remnants of the "Holy Roman Empire of the German Nation", but that wasn't Germany. There were numerous predominently German-speaking principalities within that empire and outside it, but none of them were "Germany" either. So I suspect the answer is "none."
As to whether there was a president in 1719, I don't know. There was no President of the United States for obvious reasons. But there might have been the title "president" in some context somewhere (although I don't think any heads of state had that title at that point in history). Perhaps some organization had a "president" (in the sense of "one presiding"). But do such organizations "declare war"? Hardly.
It all sounds like this question will turn up nothing.
President Franklin Delano Roosevelt was president when World War II began.
Germany declared war on the US, the US then declared war on Germany.
Winston Churchill was not the president, he was the Prime Minister, he declared war on Germany
The US did not declare war on Germany. Germany declared war on the US, on December 11, 1941. This was four days after the Japanese attacked Pearl Harbor, and three days after the US declared war on Japan. Shortly after, Italy also declared war on the US. The procedure is the president asks Congress for a Declaration of War, and Congress then votes on the question.
After Japan attcked Pearl Harbor we declared war of Japan, and Germany.
The US Constitution provides that the congress shall declare war. The congress declared war on Germany when Woodrow Wilson was president in 1917 and when Franklin Delano Roosevelt was president in 1941.
According to Article 1, Section 8 of the Constitution, Congress has the power to declare war. But the President is the commander-in-chief of the armed forces.
President Franklin Delano Roosevelt was president when World War II began.
Germany declared war on the US, the US then declared war on Germany.
After Japan bombed Pearl Harbor we declared war on them. Germany was an ally of Japan so they declared war on us. Italy was an ally of Germany so they went along with Germany and declared war.
President Woodrow Wilson declared war on Germany in World War I on April 6, 1917.
Winston Churchill was not the president, he was the Prime Minister, he declared war on Germany
America declared war on Germany in 1941.
I don't think that the US declared war on Germany. Germany declared war on the US on December 11th 1941
If this question is in reference to World War II, most countries declared war on Germany because Germany declared war on them.
The US did not declare war on Germany. Germany declared war on the US, on December 11, 1941. This was four days after the Japanese attacked Pearl Harbor, and three days after the US declared war on Japan. Shortly after, Italy also declared war on the US. The procedure is the president asks Congress for a Declaration of War, and Congress then votes on the question.
USA didn't declare war on Germany, Germany declared war on the USA. Germany declared war on the USA because the USA declared war on japan when the Japanese attacked pearl harbour in Hawaii