Europe was where all 92 naturally occurring elements were initially discovered and identified. However, as atomic research progressed, the focus on discovering artificial elements shifted to the USA.
Graphic taken from the book:
World of the Elements, Elements of the World
Hans-Jürgen Quadbeck-Seeger
Wiley-VCH Verlag GmbH & Co, KGaA, Weinheim, 2007
Print ISBN: 9783527320653, Online ISBN: 9783527611577
DOI: 10.1002/9783527611577