Final answer:
Obama creates cohesion by highlighting the importance of citizens' participation in empowering the Constitution, referring back to the principle of 'We the People' and reinforcing themes of participation and the rule of law.
Step-by-step explanation:
Former President Barack Obama creates cohesion in his speech by emphasizing the role of the people in giving power to the Constitution. He draws upon the principle of popular sovereignty, as outlined in the Constitution's Preamble "We the People", to underscore the importance of participation and upholding freedoms and laws. Obama uses repetition of themes like "participation", "freedoms", and the "rule of law" to unify his message that the Constitution's strength is derived from the ongoing commitment of American citizens.