Wal-Mart struggled in its expansion into the German retail market in the late 1990s and early 2000s. Key reasons for its struggles included a lack of strategic preparation and understanding of the German market. Ronald Tiarks, who was appointed to lead Wal-Mart's German division, did not have sufficient experience in Germany and made detrimental decisions like changing the official language to English. This angered existing employees. Wal-Mart also failed to properly integrate with German labor unions and did not establish effective supplier relationships. Due to these missteps, Wal-Mart faced difficulties that ultimately caused it to exit the German market.