Which painter created a number of works that used stylized, abstract forms at a remarkably early date — 1910 and 1911 — and is considered the first American artist to have created such purely nonrepresentational imagery?

Which painter — who exhibited in the first Der Blaue Reiter exhibition in Munich, December 1911 — was the only American artist associated with this group of early 20th Century European Modernists?

Answers here~ https://schristywolfe.com/2015/08/02/august-2/