15th President of the USA (1857–61). He consistently leaned towards the pro-slavery side in the developing dispute over slavery. Towards the end of his term the issue grew more fraught and he retired from politics in 1861.
科学参考收录了60776条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。