Collective bargaining was used by unions to allow the union leaders to negotiate wages, labor contusions, etc with employers. The goal was to increase wages, better working conditions, etc.
Medical technology to treat malaria allowed Europeans to more successful colonize tropical areas during 1800s. During 1800s European considered malaria as a massive treat to their plan to colonize west Africa. The discovery for a medicine for malaria enabled European to colonize west Africa..
