Fellow citizens -pardon me and allow me to ask why am i called upon to speak here today? what have i or those i represent to do with your national independence? are the great principles of political freedom and of natural justice embodied in that declaration of independence, extended to us? And am I therefore called upon to bring our humble offering to the national altar, and to confess the benefits, and express devout gratitude for the blessings, resulting from your independence to us ? 

First passage the tone is exasperated. 

while contemplative might seem like and option because of the thoughtful nature of the text 

choice Ais correct because the speaker is frustrated by the thought of being included when he felt that the fellow member of his race were being excluded. 

The speaker is not non chalant nor accepting 

would to god , both for your sakes and ours that affirmative answer could be truthfully returned to these questions! then would my fast task be light, and my burden easy and delightful. for who is ther so cold that a nation sympathy could not warm him ? who so obdurate and dead to claims of gratitude that would not thankfully acknowledge such priceless benefits? who so stolid and selfish 

contemplative:

• Someone who is contemplative spends a lot of time thinking deeply, reflecting, or being thoughtful, often in a quiet and calm way.

• It can also describe a mood or atmosphere that feels peaceful and thoughtful.

"Exasperated" means feeling very frustrated, annoyed, or irritated—often because something keeps happening over and over and it wears down your patience.