Which of the following conclusions can best be drawn about the ability of congress to prevent the civil war? congress was completely ineffective in preventing the civil war because despite their compromise, the southern states still seceded. congress was effective in delaying the war, but their refusal to decisively address the issue of slavery led to their inability to prevent war. congress was effective in making compromises that appealed to both the north and the south, but their inability to find a long-term solution regarding new territories propelled the nation to war. congress was ineffective at preventing war because many of the nation’s most powerful politicians were former military leaders who wanted to be in battle again.