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Which earlier German states were called the First Reich and the Second Reich?

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Nazi SS troops march in formation carrying banners with swastikas and eagles at the 1933 Party Day rally in Nuremberg, Germany, with trees in the background. — Third Reich A Nazi Party rally at Nürnberg, Germany, in 1933.

The term "Reich" (German for "empire") was used by the Nazi regime to frame their government as the historical successor to two previous German states.12

The First Reich: This refers to the Holy Roman Empire, which existed from the 9th or 10th century until 1806.123
The Second Reich: This refers to the German Empire led by the Prussian Hohenzollern dynasty, which lasted from 1871 to 1918.12

The Nazi regime adopted the designation "Third Reich" to establish a sense of historical continuity and legitimacy for their own rule, which lasted from 1933 to 1945.12