"It remained to persuade Mexico to recognise this state of affairs, and also to fix the boundaries of Texas. President Polk was determined to push them as far south as possible, and war was inevitable. It broke out in May 1846. Meanwhile a similar train of events was unfolding on the other side of the continent. All this time American penetration of the West had continued, often with grim experiences of starvation and winter snows. Nothing could stop the migration towards the Pacific. The lure of the rich China trade and the dream of controlling the Western Ocean brought the acquisition of California to the fore, and gave her even more importance in American eyes than Texas. In June 1846 the American settlers in California, instigated from Washington, raised the Bear Flag as their standard of revolt and declared their independence on the Texan model. Soon afterwards American forces arrived and the Stars and Stripes replaced the Bear."