"From Nebraska, from Arkansas,

Central inland race we are, from Missouri, with the continental blood intervein'd,

All the hands of comrades clasping, all the Southern, all the Northern,

Pioneers! O pioneers!"

Please explain what Whitman means with this stanza (extracted from 'Pioneers! O Pioneers' by Walt Whitman)

[EDIT - I've changed my mind]:

The pioneers from Nebraska and Arkansas are coming

The pioneers coming from Missouri are joining in; they have more of a mixed continental blood / inland blood

All the pioneers are joining in the common effort of exploring and building the new country

He is exalting and lauding all of them
with the continental blood intervein'd

made up of the offspring of the intermarriage of people from the many countries of the European continent who immigrated to the U.S.

This question of national origins is (or at least used to be) a topic of conversation in the U.S. when meeting new people. Nowadays it's somewhat passé.

-- I'm half Italian, a quarter French, and a quarter Irish. What are you?
-- I'm German on my mother's side and Spanish on my father's side.
-- Now I understand. Your last name is Hispanic but you don't look at all Hispanic. You must take after your mother more.

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Thank you Marius Hancu for taking time to help me. Your explanation is indeed very helpful.

Please do me a favour and tell me a little bit more about "the mixed continental blodd / inland blood."

- Can "continental" be of Europe???

There could be that Whitman says/knows that the people from Missouri have their blood originating in the inland part of (middle of) USA with some fresh/new European inserts.

where you can see that Missouri was bought from the French (Lousiana Purchase).

Continental could be "of Europe" or could refer to the North American continent.

He could make a reference to the mixing in Missouri of French blood with the American blood (of British extraction).
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 CalifJim's reply was promoted to an answer.
Thank you, Calif Jim, so much for your help.