Answer:
Two possible answers
Step-by-step explanation:
1. The Paris peace conference allowed Germany representatives to attend, but they were not allowed to speak, meaning in no way their actions were able to be justified. This meant that Germany was heavily taxed with repercussions (payments they had to make to the winning countries) which lead to the absolute destruction of their economy. This would eventually lead to the election of Adlof Hilter, who promised to fix the economy, and the rest is history.
2. During the first world war Japan was actually allied with the Allied nations (the US, France, Britain). However, at the conference they were disregarded and disrespected to the point that they actually stormed out. This left them feeling bitter toward the Allied powers, leading to their eventually alliance with Germany which also played a huge role in the future of Europe.