The Mid 2000s started in 2004 and lasted until mid 2007 culture wise. This is the era of transitioning. Especially in culture.
MySpace was what Instagram is today.
50 Cent was the face of urban
music and culture. Justin Timberlake ran pop
music. Shirts went from XXXL to M/L in a span of 2 years (2005-2007). The internet became more accessible. YouTube was created and Steve Jobs introduced the first IPhone which ended the mid 2000s.