"Seminal texts often include a call to action, a request to do or take part in something."
What next steps does Lincoln believes should be taken?

I believe the answer is, Lincoln believes they should take action or request to do so and take part in what is going on. He doesn't wish to sit around during this period of time.

I hope this helps ^^

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a low four-wheeled open carriage of a kind formerly used in russia.